king nut hickory vs big shellbark hickory

king nut hickory and big shellbark hickory both are nouns.

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

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

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

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

king nut hickory (noun)	big shellbark 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