coercion has 1 distinct synonym 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.
the act of compelling by force of authority
using force to cause something to occur
“though pressed into rugby under compulsion I began to enjoy the game”
Synonyms, antonyms and the broader and narrower relations for coercion come from Princeton University’s WordNet. Full sources and licences.