1) Furnish with synonyms 
• (v. t.) To express by a synonym or synonyms; to give the synonym or synonyms corresponding to.
Syn·on'y·mize transitive verb [ imperfect & past participle Synonymized ; present participle & verbal noun Synonymizing .] To express by a synonym or synonyms; to give the synonym or synonyms corresponding to. « This word 'fortis' ...
synonymize, synonymized, synonymizing To provide an analysis or listing of the synonyms of a word or expression.
to give synonyms for (a word, name, etc.); furnish with synonyms.