interchange has 13 distinct synonyms spread across 7 of its 8 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.
a junction of highways on different levels that permits traffic to move from one to another without crossing traffic streams
mutual interaction; the activity of reciprocating or exchanging (especially information)
the act of changing one thing for another thing
“Adam was promised immortality in exchange for his disobedience”
reciprocal transfer of equivalent sums of money (especially the currencies of different countries)
“he earns his living from the interchange of currency”
cause to change places
“interchange this screw for one of a smaller size”
Synonyms, antonyms and the broader and narrower relations for interchange come from Princeton University’s WordNet. Full sources and licences.