(n.) One of two or more words which are equivalents of each other\; one of two or more words which have very nearly the same signification, and therefore may often be used interchangeably. See under Synonymous.

Doppelganger actual thing antonym articulation carbon copy copy dead ringer ditto double duplicate equivalent exact counterpart expression facsimile free form homograph homonym homophone idem identical same lexeme linguistic form locution logos metonym minimum free form monosyllable no other none other polysyllable replica selfsame spit and image spitting image syllable term the same the same difference twin usage utterance verbalism verbum very image very same vocable word