Carya aquatica vs hickory

Carya aquatica and hickory both are nouns.

Word	Noun	Adjective	Verb	Adverb
Carya aquatica	Yes	No	No	No
hickory	Yes	No	No	No

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

Carya aquatica: hickory of southern United States having many narrow leaflets and rather bitter nuts
hickory: American hardwood tree bearing edible nuts

Other hypernyms of Carya aquatica include hickory tree.

Carya aquatica (noun)	hickory (noun)
hickory of southern United States having many narrow leaflets and rather bitter nuts	American hardwood tree bearing edible nuts
	valuable tough heavy hardwood from various hickory trees