blow has 48 distinct synonyms spread across 14 of its 30 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.
exhale hard
“blow on the soup to cool it down”
free of obstruction by blowing air through
“blow one's nose”
make a sound as if blown
“The whistle blew”
spend lavishly or wastefully on
“He blew a lot of money on his new home theater”
sound by having air expelled through a tube
“The trumpets blew”
play or sound a wind instrument
“She blew the horn”
provide sexual gratification through oral stimulation
spout moist air from the blowhole
“The whales blew”
lay eggs
“certain insects are said to blow”
cause to be revealed and jeopardized
“The story blew their cover”
allow to regain its breath
“blow a horse”
Synonyms, antonyms and the broader and narrower relations for blow come from Princeton University’s WordNet. Full sources and licences.
forceful exhalation through the nose or mouth
“he gave his nose a loud blow”