millet vs cereal

millet and cereal both are nouns.

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

As nouns, cereal is a hypernym of millet; that is, cereal is a word with a broader meaning than millet:

millet: small seed of any of various annual cereal grasses especially Setaria italica
cereal: foodstuff prepared from the starchy grains of cereal grasses

Other hypernyms of millet include food grain, grain.

As nouns, cereal is a hypernym of millet; that is, cereal is a word with a broader meaning than millet:

millet: any of various small-grained annual cereal and forage grasses of the genera Panicum, Echinochloa, Setaria, Sorghum, and Eleusine
cereal: grass whose starchy grains are used as food: wheat, rice, rye, oats, maize, buckwheat, millet

Other hypernyms of millet include cereal grass.

millet (noun)	cereal (noun)
small seed of any of various annual cereal grasses especially Setaria italica	a breakfast food prepared from grain
any of various small-grained annual cereal and forage grasses of the genera Panicum, Echinochloa, Setaria, Sorghum, and Eleusine	foodstuff prepared from the starchy grains of cereal grasses
	grass whose starchy grains are used as food: wheat, rice, rye, oats, maize, buckwheat, millet

millet (adjective)	cereal (adjective)
	made of grain or relating to grain or the plants that produce it