big shellbark vs king nut hickory

big shellbark and king nut hickory both are nouns.

Word	Noun	Adjective	Verb	Adverb
big shellbark	Yes	No	No	No
king nut hickory	Yes	No	No	No

As nouns, big shellbark and king nut hickory are synonyms defined as:

big shellbark and king nut hickory: hickory of the eastern United States resembling the shagbark but having a much larger nut

Other synonyms of big shellbark include big shagbark, big shellbark hickory, Carya laciniosa, king nut.

big shellbark (noun)	king nut hickory (noun)
hickory of the eastern United States resembling the shagbark but having a much larger nut	hickory of the eastern United States resembling the shagbark but having a much larger nut