rice has 5 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.
grains used as food either unpolished or more often polished
annual or perennial rhizomatous marsh grasses; seed used for food; straw used for paper
English lyricist who frequently worked with Andrew Lloyd Webber (born in 1944)
United States playwright (1892-1967)
sieve so that it becomes the consistency of rice
“rice the potatoes”
Synonyms, antonyms and the broader and narrower relations for rice come from Princeton University’s WordNet. Full sources and licences.