fly has 14 distinct synonyms spread across 8 of its 20 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.
move quickly or suddenly
“He flew about the place”
be dispersed or disseminated
“Rumors and accusations are flying”
change quickly from one emotional state to another
“fly into a rage”
display in the air or cause to float
“fly a kite”
travel over (an area of land or sea) in an aircraft
“Lindbergh was the first to fly the Atlantic”
two-winged insects characterized by active flight
1 of the 20 recorded senses carries no synonym, antonym or related term, so it is not shown above. Every sense, with its definition and examples, is on the full entry for fly.
Synonyms, antonyms and the broader and narrower relations for fly come from Princeton University’s WordNet. Full sources and licences.
fisherman's lure consisting of a fishhook decorated to look like an insect