black hickory vs white-heart hickory

black hickory and white-heart hickory both are nouns.

Word	Noun	Adjective	Verb	Adverb
black hickory	Yes	No	No	No
white-heart hickory	Yes	No	No	No

As nouns, black hickory and white-heart hickory are synonyms defined as:

black hickory and white-heart hickory: smooth-barked North American hickory with 7 to 9 leaflets bearing a hard-shelled edible nut

Other synonyms of black hickory include big-bud hickory, Carya tomentosa, mockernut, mockernut hickory.

black hickory (noun)	white-heart hickory (noun)
an American hickory tree having bitter nuts	smooth-barked North American hickory with 7 to 9 leaflets bearing a hard-shelled edible nut
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