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
Synonyms, antonyms and the broader and narrower relations for stub come from Princeton University’s WordNet. Full sources and licences.
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”