Duolingo English Test Vocabulary List: 500+ Essential Words

Academic Word List essentials, topic clusters for education, environment and business, transition words and idioms, and how to use them in tasks.

Lume Test

Apr 18, 2026

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5 min read

Duolingo English Test Vocabulary List: 500+ Essential Words

Key Takeaways

Academic Word List essentials, topic clusters for education, environment and business, transition words and idioms, and how to use them in tasks.

The Duolingo English Test (DET) is a computer-adaptive test, and for writing questions its grading engine evaluates lexis (vocabulary), including lexical diversity and lexical sophistication. A Duolingo English Test vocabulary list is useful for learners at any level. In this guide you will find 55 essential words and expressions: academic words, topic-based clusters, transition words and collocations. You will also see how to use these words naturally in speaking and writing tasks, in your own sentences.

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Understanding the DET Vocabulary Framework

A good DET vocabulary is not only about how many words you know. For writing questions, the grading engine evaluates lexis (vocabulary), which the Duolingo Help Center describes as lexical sophistication and lexical diversity, together with choice of words, formation of words and spelling. In practice, this means using a range of words that fit the context and spelling them correctly. Most DET questions are also timed, so words you can recall quickly are more useful than words you only half remember.

The Help Center says the grading engine evaluates several aspects of open response questions. For writing questions it lists content, discourse coherence, lexis and grammar. Lexis covers lexical diversity, lexical sophistication, choice of words, formation of words and spelling. For speaking questions it lists content, fluency and pronunciation. This means the words in this guide help most in writing, and in speaking they help you express your ideas clearly and precisely. For example, writing “phenomenom” instead of “phenomenon” is a spelling error.

The Core Duolingo English Test Vocabulary List

A useful vocabulary mixes academic foundations, topic-specific terms and linking words. Below is the basic Duolingo English Test vocabulary list. It is grouped so you can learn it step by step.

Essential Academic Words

These are general academic words that appear often in university-level reading. Learn each one with its meaning and a typical context, so that you can use it accurately in your own writing.

Word	Definition	Example Sentence
Analyze	To examine in detail to explain and interpret.	Researchers must analyze the data before drawing a conclusion.
Concept	An abstract idea or general notion.	The concept of renewable energy is gaining global popularity.
Establish	To set up, start, or create something permanent.	The university seeks to establish a new research facility.
Indicate	To point out, show, or suggest.	Recent surveys indicate a shift in consumer behavior.
Significant	Sufficiently great or important to be worthy of attention.	There is a significant difference between the two theories.
Theory	A system of ideas intended to explain something.	Darwin’s theory of evolution changed biological science.
Variable	An element or factor that is liable to change.	Temperature is a key variable in this chemical reaction.
Acquisition	The act of gaining a skill or possession.	Language acquisition is faster in early childhood.
Approach	A way of dealing with a situation or problem.	We need a new approach to solve the urban housing crisis.
Benefit	An advantage or profit gained from something.	Regular exercise provides a major benefit to mental health.
Constituent	A part of a whole; a component.	Oxygen is a major constituent of the Earth’s atmosphere.
Derive	To obtain something from a specific source.	Many medicines are derived from natural plant extracts.

Topic-Based Vocabulary Clusters

Grouping words by topic is a practical way to link related words together, which helps when you meet them in “Write About the Photo” or “Interactive Reading” tasks.

Education & Technology

These words are useful when you read, write or speak about school, learning and technology.

Word	Definition	Example Sentence
Curriculum	The subjects comprising a course of study.	The school is updating its curriculum to include coding.
Pedagogy	The method and practice of teaching.	Modern pedagogy focuses more on student participation.
Innovation	A new method, idea, or product.	Technological innovation is changing the way we learn.
Virtual	Simulated by computer software.	Many students now attend virtual classrooms from home.
Literacy	The ability to read, write, or understand a field.	Digital literacy is an essential skill in the modern workplace.
Automation	Use of machines or software to do work with little human effort.	Automation has replaced many repetitive manual tasks.
Algorithm	A set of rules for calculations or problem-solving.	The social media algorithm determines what content you see.
Synchronous	Happening at the same time.	Synchronous learning allows for real-time interaction.
Disruptive	Causing major change by replacing existing ways of doing things.	AI is considered a disruptive force in many industries.

Environment & Society

These words are useful for topics about society and the environment, such as those you may meet in the “Writing Sample” and “Speaking Sample”.

Word	Definition	Example Sentence
Sustainability	Ability to be maintained without exhausting resources.	Companies are now prioritizing environmental sustainability.
Biodiversity	The variety of life in a particular habitat.	Protecting biodiversity is crucial for a healthy planet.
Urbanization	The process of making an area more urban.	Rapid urbanization leads to increased demand for housing.
Conservation	Prevention of wasteful use of a resource.	Water conservation is vital during the summer months.
Demographic	Relating to the structure of populations.	The demographic shift shows an aging population.
Mitigate	To make something less severe or painful.	We need to mitigate the effects of climate change.
Pollutant	A substance that pollutes the environment.	Carbon dioxide is a major atmospheric pollutant.
Ecosystem	Biological community of interacting organisms.	The rainforest is a complex and fragile ecosystem.
Infrastructure	Basic physical structures like buildings and roads.	The city needs to invest in better transport infrastructure.

Business & Economy

These words are useful when you read, listen, write or speak about work and money. You may also meet them in reading and listening passages such as those in Interactive Listening.

Word	Definition	Example Sentence
Revenue	Income, especially of a company.	The tech giant reported record revenue this quarter.
Equity	The value of shares; fairness and impartiality.	Employees were offered equity in the new startup.
Monopoly	Exclusive control of the supply of a commodity.	The government prevents any single firm from having a monopoly.
Inflation	A general increase in prices.	High inflation reduces the purchasing power of consumers.
Fiscal	Relating to government revenue and taxes.	The government announced new fiscal policies to boost growth.
Recession	A period of temporary economic decline.	Many businesses struggled to survive during the last recession.
Entrepreneur	A person who organizes and operates a business.	A successful entrepreneur must be willing to take risks.
Globalization	Process of international influence and integration.	Globalization has increased competition among local firms.
Commodity	A raw material or primary product.	Oil is one of the most traded commodities in the world.

Transition Words for Cohesion

For writing questions, the Help Center lists discourse coherence among the aspects it evaluates, including cohesion and the progression of ideas. Linking words help you show how your ideas connect.

Word	Definition	Example Sentence
Furthermore	In addition; besides.	The product is high quality; furthermore, it is affordable.
Consequently	As a result.	He missed the train; consequently, he was late for work.
Nevertheless	In spite of that; however.	The task was difficult; nevertheless, she completed it.
Conversely	In a contrary or opposite way.	He loves the heat; conversely, his wife prefers the cold.
Simultaneously	Happening at the same time.	The movie was broadcast simultaneously across the world.
For instance	As an example.	Many students use online tools to study; for instance, they watch short video lessons.
Moreover	As a further matter; besides.	It is a beautiful day; moreover, we have the day off.
In retrospect	Reviewing the past with new knowledge.	In retrospect, I should have studied much harder.

Useful Idioms and Collocations

Words often combine with other words in set pairs or phrases, called collocations. Learning them together with the words helps your English sound natural. Use idioms carefully, and only when they fit the topic and tone of your answer.

Idiom/Collocation	Meaning/Definition	Example Sentence
Bear in mind	To remember or consider specific information.	Please bear in mind that the deadline is tomorrow.
A double-edged sword	Something with both good and bad consequences.	High-speed internet is a double-edged sword for students.
In the long run	Eventually; over a long period of time.	Regular saving will pay off in the long run.
Bridge the gap	To reduce the difference between two things.	Technology can help bridge the gap between urban and rural areas.
Take into account	To consider specific facts when making a judgment.	We must take into account the cost of living before relocating.
Vicious circle	A sequence of causes that intensify a problem.	Poverty often leads to a vicious circle of debt.
The tip of the iceberg	A small, visible part of a much larger problem.	These climate reports are only the tip of the iceberg.
Status quo	The existing state of affairs or social situation.	Many people are afraid to challenge the status quo.

How to Use These Words in Real Duolingo English Test Tasks

Using vocabulary in speaking responses

In speaking tasks such as Read, Then Speak and Interactive Speaking, the Help Center advises you to speak naturally and clearly and to use varied words and structures. Interactive Speaking replaced Listen, Then Speak on 1 July 2025. It is a simulated conversation with an animated character: 6 to 8 questions, with 35 seconds to answer each one. A simple habit is to avoid repeating the exact words of the prompt and to use a different word where it fits. These ideas are for practice only. The Help Center asks you to answer in the moment and in your own words, without prepared, memorized or rehearsed responses.

For example, the prompt may say, “Describe a difficult problem you solved.” Instead of saying “A difficult problem I solved was…” you could say “A challenging obstacle I managed to overcome was…” or “One complex problem I encountered was…” This shows more variety in your word choice.

Using vocabulary in writing responses

“Write About the Photo” gives you 1 minute to describe an image. Precise words help you describe it in detail. The Help Center suggests going beyond simple labeling and describing the image in detail, and says a longer response can show more of your skills. Instead of “There is a nice car near some trees,” you could write: “The sleek, metallic car is parked next to a row of colorful blossoming trees.”

For the Writing Sample (5 minutes), the Help Center suggests treating your answer as a short essay, varying your sentence structure and word choice, and leaving time to check spelling, grammar and punctuation. Precise content words help you say more with fewer filler words. “Global warming is very bad for the world” is less precise than “Global warming is a serious threat to biodiversity on our planet.”

Using vocabulary in reading and listening tasks

Read and Select asks, “Is this a real English word?” You see one word at a time and click YES or NO. Read carefully, because some words may look real but have small differences from real English words. A wide vocabulary and careful reading help here.

In Read and Complete, you type the missing letters to complete the unfinished words in a passage, so vocabulary, spelling and context all matter. If you see “The gove_____ is pass____ a law,” your knowledge of word patterns helps you think of “government” and “passing.” In Listen and Type, you type what you hear, so knowing a word and how to spell it helps.

Interactive Reading has several sub-types: Complete the Sentences, Complete the Passage, Highlight the Answer, Identify the Idea and Title the Passage. A rich vocabulary helps in all of them. In Complete the Sentences you choose the best word for each blank, and in Title the Passage you choose the best title for the whole text, even when other options are somewhat relevant.

Best Strategies to Memorize Duolingo English Test Vocabulary Faster

Learn words in context, not as isolated lists

Memorizing words one by one from a list is hard to keep up. Words are easier to remember when you link them to meaning, examples and related words.

Take a word like “Sustainable.” Try writing three different sentences using this word: one sentence using it in the context of the environment, one using it in business, and one using it in personal habits. This can help you retain this vocabulary more deeply.

Use spaced repetition and weekly review cycles

Memory of new words fades if you never review them, which is often called the forgetting curve. Reviewing words at spaced intervals helps you keep them.

Strategy: Review words after 1 day, 3 days, 1 week, and 1 month. This helps move vocabulary from short-term memory to long-term memory.

Practice active recall and output

Passive reading is not enough. You must force your brain to “produce” the word.

Strategy: Cover the word’s definition and try to explain it verbally.

Track weak vocabulary areas with feedback

Many learners repeat the same errors. You may be constantly spelling ‘Necessary’ with two ‘c’s or ‘Affect’ when you need to write ‘Effect’.

Strategy: Use a digital log to keep track of errors. Log each word you get wrong in the mock test and try to correct them weekly.

Common Vocabulary Mistakes That Lower Your Duolingo English Test Performance

Memorizing rare words instead of useful words

One common misconception is that using extremely rare words guarantees a high DET score. It does not. The Help Center lists lexical sophistication and choice of words among the aspects it evaluates for writing, so your words should be accurate and suit the context. A very rare word used in the wrong place does not help. It is better to use words you know well and can use correctly.

Ignoring collocations and word forms

A common pitfall is memorizing the definition of a word and forgetting its collocations and word forms. For instance, “make a contribution” is the usual collocation, and “do a contribution” sounds unnatural. Using the wrong word form, such as “analysising” instead of “analysis” or “analyzing”, is an error that can lower the quality of your writing. The Help Center lists formation of words among the lexis aspects for writing. Learn each word together with its collocations and word forms.

Using the same basic words repeatedly

Repeating the same basic words is a common habit. If you only use words such as “good,” “bad” and “think” throughout your essay, your writing shows less lexical diversity, which is one of the lexis aspects the Help Center lists for writing questions. Try replacing “good” with “beneficial”, “bad” with “detrimental”, and “think” with “believe” or “argue”, where they fit the meaning.

Not practicing under timed conditions

The DET is adaptive, and most of its questions are timed (for example, Read and Select gives 5 seconds per word and Write About the Photo gives 1 minute). It is not only the amount of vocabulary you know that matters, but also how quickly you can use it. Some learners do not practice under timed conditions and freeze when they have limited time to respond. If it takes you too long to find a word, you lose time that you could spend on your ideas or grammar.

A strong Duolingo English Test vocabulary list is not only about quantity. Quality, speed and accuracy matter too. Combining academic words, topic clusters, transition words and collocations, and practicing them in your own sentences, helps you use them with more confidence.

FAQ

Should you study from a Duolingo English Test Vocabulary List alone?

No. A list is just a tool. To make vocabulary your own, you must listen to podcasts, read news, and most importantly, use them when speaking and writing.

Are Synonyms and Antonyms Important for the Test?

Yes, they are useful. Knowing synonyms and antonyms helps you notice small differences in meaning and avoid repeating the same word when you write or speak. Wider word knowledge also supports reading tasks such as Interactive Reading.

How often should I review vocabulary before the test?

Regular short sessions are usually easier to keep up than one long session a week. For example, you could review for 30 minutes each day.

Is topic-based vocabulary better than alphabetical vocabulary lists?

Topic-based lists are usually easier to learn from, because the words come with context and you can use them in your own sentences about a topic. Alphabetical lists are fine for quick reference but give less context.

Can spelling affect my Duolingo English Test vocabulary performance?

Yes, for writing. The Help Center lists spelling as part of the lexis aspect for writing questions, so spelling mistakes can affect how your writing is evaluated. In Read and Complete you type the missing letters of words, so practicing spelling helps there too.

Is there a negative marking for wrong answers in vocabulary sections?

In the “Read and Select” section, there is no extra penalty for a wrong answer, and a missing response is marked incorrect, so it is best to answer every word.