king nut vs king nut hickory

king nut and king nut hickory both are nouns.

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

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

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

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

king nut (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