big shellbark vs king nut

big shellbark and king nut both are nouns.

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

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

big shellbark and king nut: 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 hickory.

big shellbark (noun)	king nut (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