API URL
POST /v1/lookup, POST /v1/lookup
Headers
Code
Content-Type: application/jsonBody Parameters
Param
Type
Description
word
required
string
Target word for thesaurus lookup (used in /lookup, /synonyms, /antonyms, /related endpoints)
q
required
string
Partial word or letters to search for (used in /search endpoint). Will find words containing this text (case-insensitive). Note: 'q' is short for 'query'
limit
optional
integer
Default 25, max 100
Example Request
Code
{
"term": "fast",
"limit": 5
}Successful Response
Status
HTML
200 OKBody
Code
{
"query": {
"term": "fast",
"relation": "synonym",
"limit": 5
},
"results": [
{
"term": "quick",
"pos": "adj"
},
{
"term": "rapid",
"pos": "adj"
}
],
"page": {
"limit": 5,
"offset": 0,
"total_estimate": 4
}
}Field
Type
Description
word
string
query.term | string | Original word analyzed for vocabulary enrichment and content enhancement
data
object
results[].term | string | Related word providing vocabulary alternatives for content diversification
data.synonyms
array
results[].pos | string | Part of speech classification (noun, verb, adjective) for grammatically appropriate substitutions
data.antonyms
array
results[].relation | string | Semantic relationship type (synonym, antonym, hypernym) for precise content optimization
data.related
array
results[].score | number | Relevance ranking for context-appropriate word selection in professional writing
synonyms
array
page.limit | number | Maximum results returned for pagination control in content creation workflows
antonyms
array
page.total_estimate | number | Approximate total matches available for comprehensive vocabulary exploration
related
array
meta.dataset_version | string | WordNet database version ensuring consistent lexical data for enterprise content systems
results
array
Comprehensive lexical relationships including synonyms, antonyms, and semantic connections
results[].word
string
—
results[].score
number
—
query
string
—
limit
integer
—
correlationId
string
—
Error Response
Example
Code
400 bad_request – Invalid or missing parameters
404 not_found – Route not found
429 rate_limit – Too many requests
500 server_error – Internal server errorLast Updated: May 4, 2026