Carya laciniosa vs hickory tree

Carya laciniosa and hickory tree both are nouns.

Word	Noun	Adjective	Verb	Adverb
Carya laciniosa	Yes	No	No	No
hickory tree	Yes	No	No	No

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

Carya laciniosa: hickory of the eastern United States resembling the shagbark but having a much larger nut
hickory tree: American hardwood tree bearing edible nuts

Other hypernyms of Carya laciniosa include hickory.

Carya laciniosa (noun)	hickory tree (noun)
hickory of the eastern United States resembling the shagbark but having a much larger nut	American hardwood tree bearing edible nuts