silkgrass vs mountain rice

silkgrass and mountain rice both are nouns.

Word	Noun	Adjective	Verb	Adverb
silkgrass	Yes	No	No	No
mountain rice	Yes	No	No	No

As nouns, silkgrass and mountain rice are synonyms defined as:

silkgrass and mountain rice: valuable forage grass of dry upland areas and plains of western North America to northern Mexico

Other synonyms of silkgrass include Indian millet, Oryzopsis hymenoides, silk grass.

silkgrass (noun)	mountain rice (noun)
valuable forage grass of dry upland areas and plains of western North America to northern Mexico	valuable forage grass of dry upland areas and plains of western North America to northern Mexico