sanity-plugin-taxonomy-manager

Create and manage SKOS compliant taxonomies, thesauri, and classification schemes in Sanity Studio.

thesaurus-service

Provides synonym for word, uses remote sites (words.bighugelabs.com, thesaurus.altervista.org, thesaurus.com, etc.)

moby

An open-source website (and CLI) for searching the largest thesaurus in the English language.