Wordnik
Access dictionary definitions, synonyms, pronunciations, and usage examples via API.
Read docs Updated 2026-06-17
What is Wordnik?
Wordnik is an API that supplies lexical information drawn from dictionary sources, covering definitions, pronunciations, synonyms, and example usage for English words.
It supports natural language processing tasks and is used by developers building language tools, educational platforms, or applications that require structured word data.
What you can build with Wordnik
Build a thesaurus or writing assistant
Integrate synonyms, related words, and frequency data to suggest alternatives and show how common terms are in different contexts.
Enhance vocabulary or language apps
Pull definitions and example sentences to display rich word cards or generate contextual quizzes for learners.
Analyze word usage in text tools
Query frequency information alongside definitions to power readability scoring or content optimization features.
Get started with Wordnik
- 1Sign up at wordnik.com and generate an API key
- 2Read the endpoint reference in the developer docs
- 3Make HTTPS GET requests including your api_key parameter
- 4Test core calls such as /word.json/{word}/definitions
- 5Parse the returned JSON and handle rate-limit headers
Wordnik: pros & cons
Pros
- +Detailed definitions, examples, and frequency data in one place
- +Simple API-key authentication over HTTPS
- +Generous free tier for most hobby and small projects
- +Returns related-word graphs useful for NLP tasks
Cons
- –Rate limits enforced on free keys
- –English-only corpus
- –No official client libraries maintained by Wordnik
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Frequently asked questions
A REST API that returns dictionary-style data including definitions, synonyms, example sentences, and word frequency information.
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