cobnut vs edible nut

cobnut and edible nut both are nouns.

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

As nouns, edible nut is a hypernym of cobnut; that is, edible nut is a word with a broader meaning than cobnut:

cobnut: nut of any of several trees of the genus Corylus
edible nut: a hard-shelled seed consisting of an edible kernel or meat enclosed in a woody or leathery shell

cobnut (noun)	edible nut (noun)
nut of any of several trees of the genus Corylus	a hard-shelled seed consisting of an edible kernel or meat enclosed in a woody or leathery shell
small nut-bearing tree much grown in Europe