rush has 30 distinct synonyms spread across 12 of its 16 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 2 recorded opposites are linger, delay.
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.
grasslike plants growing in wet places and having cylindrical often hollow stems
physician and American Revolutionary leader; signer of the Declaration of Independence (1745-1813)
a sudden burst of activity
“come back after the rush”
move hurridly
“He rushed down the hall to receive his guests”
not accepting reservations
Synonyms, antonyms and the broader and narrower relations for rush come from Princeton University’s WordNet. Full sources and licences.