edible nut vs beechnut

edible nut and beechnut both are nouns.

Word	Noun	Adjective	Verb	Adverb
edible nut	Yes	No	No	No
beechnut	Yes	No	No	No

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

edible nut: a hard-shelled seed consisting of an edible kernel or meat enclosed in a woody or leathery shell
beechnut: small sweet triangular nut of any of various beech trees

edible nut (noun)	beechnut (noun)
a hard-shelled seed consisting of an edible kernel or meat enclosed in a woody or leathery shell	small sweet triangular nut of any of various beech trees