sample has 5 distinct synonyms spread across 2 of its 4 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 small part of something intended as representative of the whole
Synonyms, antonyms and the broader and narrower relations for sample come from Princeton University’s WordNet. Full sources and licences.
items selected at random from a population and used to test hypotheses about the population
all or part of a natural object that is collected and preserved as an example of its class