exchangeable has 5 distinct synonyms spread across 2 of its 3 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 unexchangeable.
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.
suitable to be exchanged
capable of being exchanged for or replaced by something of equal value
“convertible securities”
capable of replacing or changing places with something else; permitting mutual substitution without loss of function or suitability
“interchangeable electric outlets”
Synonyms, antonyms and the broader and narrower relations for exchangeable come from Princeton University’s WordNet. Full sources and licences.