return has 45 distinct synonyms spread across 21 of its 29 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.
return in kind
“return a compliment”
submit (a report, etc.) to someone in authority
“submit a bill to a legislative body”
document giving the tax collector information about the taxpayer's tax liability
“his gross income was enough that he had to file a tax return”
a coming to or returning home
“on his return from Australia we gave him a welcoming party”
the occurrence of a change in direction back in the opposite direction
getting something back again
“upon the restitution of the book to its rightful owner the child was given a tongue lashing”
the key on electric typewriters or computer keyboards that causes a carriage return and a line feed
a reciprocal group action
“in return we gave them as good as we got”
a tennis stroke that sends the ball back to the other player
“he won the point on a cross-court return”
(American football) the act of running back the ball after a kickoff or punt or interception or fumble
the act of someone appearing again
“his reappearance as Hamlet has been long awaited”
1 of the 29 recorded senses carries no synonym, antonym or related term, so it is not shown above. Every sense, with its definition and examples, is on the full entry for return.
Synonyms, antonyms and the broader and narrower relations for return come from Princeton University’s WordNet. Full sources and licences.