stud has 8 distinct synonyms spread across 6 of its 7 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.
ornament consisting of a circular rounded protuberance (as on a vault or shield or belt)
poker in which each player receives hole cards and the remainder are dealt face up; bets are placed after each card is dealt
scatter or intersperse like dots or studs
“Hills constellated with lights”
provide with or construct with studs
“stud the wall”
Synonyms, antonyms and the broader and narrower relations for stud come from Princeton University’s WordNet. Full sources and licences.