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roller coaster has 2 distinct synonyms spread across 1 of its 2 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.
anything characterized by abrupt and extreme changes (especially up and down)
“the economy has been on a roller coaster all year”
elevated railway in an amusement park (usually with sharp curves and steep inclines)
Synonyms, antonyms and the broader and narrower relations for roller coaster come from Princeton University’s WordNet. Full sources and licences.