silk grass vs Indian millet

silk grass and Indian millet both are nouns.

Word	Noun	Adjective	Verb	Adverb
silk grass	Yes	No	No	No
Indian millet	Yes	No	No	No

As nouns, silk grass and Indian millet are synonyms defined as:

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

Other synonyms of silk grass include mountain rice, Oryzopsis hymenoides, silkgrass.

silk grass (noun)	Indian millet (noun)
valuable forage grass of dry upland areas and plains of western North America to northern Mexico	sorghums of dry regions of Asia and North Africa
	valuable forage grass of dry upland areas and plains of western North America to northern Mexico