edible corn vs popcorn

edible corn and popcorn both are nouns.

Word	Noun	Adjective	Verb	Adverb
edible corn	Yes	No	No	No
popcorn	Yes	No	No	No

As nouns, popcorn is a hyponym of edible corn; that is, popcorn is a word with a more specific, narrower meaning than edible corn:

Other hyponyms of edible corn include green corn, sweet corn, hominy.

edible corn (noun)	popcorn (noun)
ears of corn that can be prepared and served for human food	small kernels of corn exploded by heat
	corn having small ears and kernels that burst when exposed to dry heat