stub has 5 distinct synonyms spread across 4 of its 9 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 short piece remaining on a trunk or stem where a branch is lost
a torn part of a ticket returned to the holder as a receipt
the small unused part of something (especially the end of a cigarette that is left after smoking)
extinguish by crushing
“stub out your cigarette now”
clear of weeds by uprooting them
“stub a field”
strike (one's toe) accidentally against an object
“She stubbed her toe in the dark and now it's broken”
Synonyms, antonyms and the broader and narrower relations for stub come from Princeton University’s WordNet. Full sources and licences.