rice vs polished rice

rice and polished rice both are nouns.

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

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

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

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