represent has 18 distinct synonyms spread across 10 of its 15 senses. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. WordNet records no antonym for it — antonymy is a relation between word forms rather than concepts, so it is deliberately sparse.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
take the place of or be parallel or equivalent to
“Because of the sound changes in the course of history, an `h' in Greek stands for an `s' in Latin”
be representative or typical for
“This period is represented by Beethoven”
be a delegate or spokesperson for; represent somebody's interest or be a proxy or substitute for, as of politicians and office holders representing their constituents, or of a tenant representing other tenants in a housing dispute
“I represent the silent majority”
serve as a means of expressing something
“The flower represents a young girl”
point out or draw attention to in protest or remonstrance
“our parents represented to us the need for more caution”
Synonyms, antonyms and the broader and narrower relations for represent come from Princeton University’s WordNet. Full sources and licences.