harp has 4 distinct synonyms spread across 2 of its 5 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 chordophone that has a triangular frame consisting of a sounding board and a pillar and a curved neck; the strings stretched between the neck and the soundbox are plucked with the fingers
a pair of curved vertical supports for a lampshade
Synonyms, antonyms and the broader and narrower relations for harp come from Princeton University’s WordNet. Full sources and licences.
a small rectangular free-reed instrument having a row of free reeds set back in air holes and played by blowing into the desired hole