wheat has 3 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.
annual or biennial grass having erect flower spikes and light brown grains
grains of common wheat; sometimes cooked whole or cracked as cereal; usually ground into flour
a variable yellow tint; dull yellow, often diluted with white
Synonyms, antonyms and the broader and narrower relations for wheat come from Princeton University’s WordNet. Full sources and licences.