pupil has 4 distinct synonyms spread across 2 of its 3 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 learner who is enrolled in an educational institution
Synonyms, antonyms and the broader and narrower relations for pupil come from Princeton University’s WordNet. Full sources and licences.
the contractile aperture in the center of the iris of the eye; resembles a large black dot
a young person attending school (up through senior high school)