S / sўnōnўmum
noun

sўnōnўmum

gen. sўnōnўmi · gender neuter · decl. 2nd
= συνώνυμον,
a word having the same meaning; a synonym
a word having the same meaning with another, a synonym, Front. Eloqu. p. 237; Prisc. 579 P.; Serv. Verg. A. 2, 128.