pecan vs edible nut

pecan and edible nut both are nouns.

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

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

pecan: smooth brown oval nut of south central United States
edible nut: a hard-shelled seed consisting of an edible kernel or meat enclosed in a woody or leathery shell

pecan (noun)	edible nut (noun)
smooth brown oval nut of south central United States	a hard-shelled seed consisting of an edible kernel or meat enclosed in a woody or leathery shell
tree of southern United States and Mexico cultivated for its nuts
wood of a pecan tree