LATIN DICTIONARYLexicon Latīnum
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“synonym” in Latin

The English word synonym itself goes back to Latin synōnymum.

Riddle & Arnold A Copious and Critical English–Latin Lexicon, 1864

synonym
vocabulum idem declarans or significans; usually plur., verba idem declarantia, idem signiricantia (Quint.). To be a synonym, idem declarare, significare, valere: a number of synonyms, collecta vocabula quae idem significant (Quint., 10, 1, 7).

Quick answer

What is the Latin word for synonym?
The usual Latin words for “synonym” are significō, valeō. The right choice depends on the sense; see the distinctions below.

Entry from J. E. Riddle & T. K. Arnold, A Copious and Critical English–Latin Lexicon (rev. C. Anthon, New York: Harper, 1864), digitised by Fergus J. P. Walsh, CC BY-SA 4.0; Latin markup adapted by latindictionary.co.