silk grass vs Oryzopsis hymenoides

silk grass and Oryzopsis hymenoides both are nouns.

Word	Noun	Adjective	Verb	Adverb
silk grass	Yes	No	No	No
Oryzopsis hymenoides	Yes	No	No	No

As nouns, silk grass and Oryzopsis hymenoides are synonyms defined as:

silk grass and Oryzopsis hymenoides: valuable forage grass of dry upland areas and plains of western North America to northern Mexico

Other synonyms of silk grass include Indian millet, mountain rice, silkgrass.

silk grass (noun)	Oryzopsis hymenoides (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