mountain rice vs Indian millet

mountain rice and Indian millet both are nouns.

Word	Noun	Adjective	Verb	Adverb
mountain rice	Yes	No	No	No
Indian millet	Yes	No	No	No

As nouns, mountain rice and Indian millet are synonyms defined as:

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

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

mountain rice (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