Lingua Robot vs Wiktionary

Lingua Robot is a RapidAPI-hosted REST dictionary covering more than 800,000 English lexical entries — words, phrasal verbs, and multiword expressions — with definitions, pronunciations, and morpheme/lemma data returned as JSON, documented on a separate Apiary reference site rather than its own marketing homepage. A live unauthenticated request against its real RapidAPI proxy host returned a reflected `access-control-allow-origin` header plus `access-control-allow-credentials: true`, reconfirming CORS; its free Basic tier covers 2,500 requests/day (then $0.004 each), with paid Pro/Ultra/Mega plans ($10-$99/month) raising the daily ceiling.

Wiktionary exposes its full multilingual dictionary — definitions, etymologies, pronunciations, and translations spanning thousands of languages — through the same MediaWiki Action API that powers Wikipedia, with no key required for read access. Cross-origin browser requests need the documented origin=* query parameter rather than a bare Origin header, since that's what actually unlocks the API's CORS headers.