shellbark vs hickory

shellbark and hickory both are nouns.

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

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

shellbark: North American hickory having loose grey shaggy bark and edible nuts
hickory: American hardwood tree bearing edible nuts

Other hypernyms of shellbark include hickory tree.

shellbark (noun)	hickory (noun)
North American hickory having loose grey shaggy bark and edible nuts	American hardwood tree bearing edible nuts
	valuable tough heavy hardwood from various hickory trees