bitternut vs hickory

bitternut and hickory both are nouns.

Word	Noun	Adjective	Verb	Adverb
bitternut	Yes	No	No	No
hickory	Yes	No	No	No

As nouns, hickory is a hypernym of bitternut; that is, hickory is a word with a broader meaning than bitternut:

bitternut: hickory of the eastern United States having a leaves with 7 or 9 leaflets and thin-shelled very bitter nuts
hickory: American hardwood tree bearing edible nuts

Other hypernyms of bitternut include hickory tree.

bitternut (noun)	hickory (noun)
hickory of the eastern United States having a leaves with 7 or 9 leaflets and thin-shelled very bitter nuts	American hardwood tree bearing edible nuts
	valuable tough heavy hardwood from various hickory trees