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collapse has 18 distinct synonyms spread across 8 of its 11 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.
collapse due to fatigue, an illness, or a sudden attack
fold or close up
“fold up your umbrella”
fall apart
“the building crumbled after the explosion”
lose significance, effectiveness, or value
“The school system is collapsing”
an abrupt failure of function or complete physical exhaustion
“the commander's prostration demoralized his men”
Synonyms, antonyms and the broader and narrower relations for collapse come from Princeton University’s WordNet. Full sources and licences.