Indian millet vs silk grass

Indian millet and silk grass both are nouns.

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

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

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

Other synonyms of Indian millet include mountain rice, Oryzopsis hymenoides, silkgrass.

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