black hickory vs hickory tree

black hickory and hickory tree both are nouns.

Word	Noun	Adjective	Verb	Adverb
black hickory	Yes	No	No	No
hickory tree	Yes	No	No	No

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

Other hypernyms of black hickory include hickory.

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

black hickory: smooth-barked North American hickory with 7 to 9 leaflets bearing a hard-shelled edible nut
hickory tree: American hardwood tree bearing edible nuts

Other hypernyms of black hickory include hickory.

black hickory (noun)	hickory tree (noun)
an American hickory tree having bitter nuts	American hardwood tree bearing edible nuts
smooth-barked North American hickory with 7 to 9 leaflets bearing a hard-shelled edible nut
North American walnut tree with hard dark wood and edible nut