rice vs starches

rice and starches both are nouns.

Word	Noun	Adjective	Verb	Adverb
rice	Yes	No	Yes	No
starches	Yes	No	No	No

As nouns, starches is a hypernym of rice; that is, starches is a word with a broader meaning than rice:

rice: grains used as food either unpolished or more often polished
starches: foodstuff rich in natural starch (especially potatoes, rice, bread)

Other hypernyms of rice include cereal, food grain, grain.

rice (noun)	starches (noun)
grains used as food either unpolished or more often polished	foodstuff rich in natural starch (especially potatoes, rice, bread)
annual or perennial rhizomatous marsh grasses; seed used for food; straw used for paper

rice (verb)	starches (verb)
sieve so that it becomes the consistency of rice