tumble has 17 distinct synonyms spread across 6 of its 13 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.
roll over and over, back and forth
fall apart
“the building crumbled after the explosion”
throw together in a confused mass
“They tumbled the teams with no apparent pattern”
fall suddenly and sharply
“Prices tumbled after the devaluation of the currency”
put clothes in a tumbling barrel, where they are whirled about in hot air, usually with the purpose of drying
“Wash in warm water and tumble dry”
suffer a sudden downfall, overthrow, or defeat
an acrobatic feat of rolling or turning end over end
Synonyms, antonyms and the broader and narrower relations for tumble come from Princeton University’s WordNet. Full sources and licences.