big shagbark vs big shellbark

big shagbark and big shellbark both are nouns.

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

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

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

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

big shagbark (noun)	big shellbark (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