big-bud hickory vs hickory

big-bud hickory and hickory both are nouns.

Word	Noun	Adjective	Verb	Adverb
big-bud hickory	Yes	No	No	No
hickory	Yes	No	No	No

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

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

Other hypernyms of big-bud hickory include hickory tree.

big-bud hickory (noun)	hickory (noun)
smooth-barked North American hickory with 7 to 9 leaflets bearing a hard-shelled edible nut	American hardwood tree bearing edible nuts
	valuable tough heavy hardwood from various hickory trees