millet vs Gramineae

millet and Gramineae both are nouns.

Word	Noun	Adjective	Verb	Adverb
millet	Yes	No	No	No
Gramineae	Yes	No	No	No

millet (noun)	Gramineae (noun)
small seed of any of various annual cereal grasses especially Setaria italica	the grasses: chiefly herbaceous but some woody plants including cereals, bamboo, reeds, sugar cane
any of various small-grained annual cereal and forage grasses of the genera Panicum, Echinochloa, Setaria, Sorghum, and Eleusine