stall has 15 distinct synonyms spread across 6 of its 14 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.
a compartment in a stable where a single animal is confined and fed
small area set off by walls for special use
a booth where articles are displayed for sale
a malfunction in the flight of an aircraft in which there is a sudden loss of lift that results in a downward plunge
“the plane went into a stall and I couldn't control it”
seating in the forward part of the main level of a theater
postpone doing what one should be doing
“He did not want to write the letter and procrastinated for days”
deliberately delay an event or action
“she doesn't want to write the report, so she is stalling”
put into, or keep in, a stall
“Stall the horse”
experience a stall in flight, of airplanes
cause an engine to stop
“The inexperienced driver kept stalling the car”
Synonyms, antonyms and the broader and narrower relations for stall come from Princeton University’s WordNet. Full sources and licences.