rice vs white rice

rice and white rice both are nouns.

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

As nouns, white rice is a hyponym of rice; that is, white rice is a word with a more specific, narrower meaning than rice:

Other hyponyms of rice include brown rice, polished rice, paddy.

rice (noun)	white rice (noun)
grains used as food either unpolished or more often polished	having husk or outer brown layers removed
annual or perennial rhizomatous marsh grasses; seed used for food; straw used for paper

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