representative has 8 distinct synonyms spread across 3 of its 7 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. Its one recorded opposite is nonrepresentative.
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.
a person who represents others
an advocate who represents someone else's policy or purpose
“the meeting was attended by spokespersons for all the major organs of government”
a member of the United States House of Representatives
an item of information that is typical of a class or group
“this patient provides a typical example of the syndrome”
standing for something else
“the bald eagle is representative of the United States”
2 of the 7 recorded senses carry no synonym, antonym or related term, so they are not shown above. Every sense, with its definition and examples, is on the full entry for representative.
Synonyms, antonyms and the broader and narrower relations for representative come from Princeton University’s WordNet. Full sources and licences.