English Dictionary API
English dictionary with 147,000 words: definitions by part of speech, usage examples, synonyms, antonyms, broader terms, IPA and ARPAbet pronunciation, syllable count, rhymes and prefix autocomplete. Inflected forms (running, cities) resolve automatically.
Authentication & base URL
Subscribe through one of our marketplace listings; your marketplace API key and base URL are shown there. All endpoints return JSON over HTTPS, served from a global edge network (typically 20–150 ms).
Endpoints
GET /v1/dictionary/{word}
Word definitions
| Parameter | In | Description | Example |
|---|---|---|---|
word * | path | English word | happy |
pos | query | Optional filter: noun, verb, adjective, adverb | |
limit | query | Max meanings 1-50 | 20 |
GET /v1/dictionary/synonyms/{word}
Synonyms
| Parameter | In | Description | Example |
|---|---|---|---|
word * | path | English word | big |
GET /v1/dictionary/antonyms/{word}
Antonyms
| Parameter | In | Description | Example |
|---|---|---|---|
word * | path | English word | good |
GET /v1/dictionary/rhymes/{word}
Rhymes and pronunciation
| Parameter | In | Description | Example |
|---|---|---|---|
word * | path | English word | love |
limit | query | Max rhymes 1-60 | 30 |
GET /v1/dictionary/search
Autocomplete words by prefix
| Parameter | In | Description | Example |
|---|---|---|---|
prefix * | query | At least 2 letters | photo |
limit | query | 1-100 | 20 |
Example
GET /v1/dictionary/search?prefix=photo&limit=20
{
"prefix": "photo",
"count": 20,
"words": [
"photo",
"photon",
"photo op",
"photocell",
"photocopy",
"photostat",
"photoflash",
"photoflood",
"photogenic",
"photograph",
"photometer",
"photometry",
"photocopier",
"photography",
"photometric",
"photomosaic",
"photophobia",
"photosphere",
"photo credit",
"photo finish"
]
}English dictionary with 147,000 words: definitions by part of speech, usage examples, synonyms, antonyms, broader terms, IPA and ARPAbet pronunciation, syllable count, rhymes and prefix autocomplete. Inflected forms (running, cities) resolve automatically.
Use cases
Writing and word-game apps, songwriting and poetry tools, education and language learning, chatbots, crossword and Scrabble helpers, SEO and copywriting tools.
Why this API
- Fast: global edge network, answers in milliseconds, no rate-limited upstream.
- 147,000 words with meanings and 126,000 with pronunciation; meanings ordered by how common they are.
- Data: WordNet 3.0 Copyright 2006 by Princeton University (WordNet License) and the CMU Pronouncing Dictionary.
- Fair pricing: Free plan 500 requests/month, Pro 25,000 for $4.99, Ultra 150,000 for $14.99.
Support
Questions or a feature you need? Open a thread in the Discussions tab.
Pricing
Free plan with 500 calls per month, then Pro (25,000 calls for $4.99/month) and Ultra (150,000 calls for $14.99/month). See all plans.