Synonym

Noun

 * 1)  A word or phrase with a meaning that is the same as, or very similar to, another word or phrase.
 * 2)  Any of the formal names for the taxon, including the valid name (i.e. the senior synonym).
 * 3)  Any name for the taxon, usually a validly published, formally accepted one, but often also an unpublished name.

Synonyms

 * equivalent, poecilonym

Antonyms

 * antonym, opposite

Derived terms

 * near-synonym

Related terms

 * synonymic
 * synonymist
 * synonymous
 * synonymy

Thesaurus
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