rice vs genus Oryza

rice and genus Oryza both are nouns.

Word	Noun	Adjective	Verb	Adverb
rice	Yes	No	Yes	No
genus Oryza	Yes	No	No	No

rice (noun)	genus Oryza (noun)
grains used as food either unpolished or more often polished	rice
annual or perennial rhizomatous marsh grasses; seed used for food; straw used for paper

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