brown hickory vs hickory

brown hickory and hickory both are nouns.

Word	Noun	Adjective	Verb	Adverb
brown hickory	Yes	No	No	No
hickory	Yes	No	No	No

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

Other hypernyms of brown hickory include hickory tree.

brown hickory (noun)	hickory (noun)
an American hickory tree having bitter nuts	American hardwood tree bearing edible nuts
	valuable tough heavy hardwood from various hickory trees