milo maize vs grain sorghum

milo maize and grain sorghum both are nouns.

Word	Noun	Adjective	Verb	Adverb
milo maize	Yes	No	No	No
grain sorghum	Yes	No	No	No

As nouns, grain sorghum is a hypernym of milo maize; that is, grain sorghum is a word with a broader meaning than milo maize:

milo maize: small drought-resistant sorghums having large yellow or whitish grains
grain sorghum: any of several sorghums cultivated primarily for grain

milo maize (noun)	grain sorghum (noun)
small drought-resistant sorghums having large yellow or whitish grains	any of several sorghums cultivated primarily for grain