big shellbark vs big shagbark

big shellbark and big shagbark both are nouns.

Word	Noun	Adjective	Verb	Adverb
big shellbark	Yes	No	No	No
big shagbark	Yes	No	No	No

As nouns, big shellbark and big shagbark are synonyms defined as:

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

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

big shellbark (noun)	big shagbark (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