bitter pignut vs bitter hickory

bitter pignut and bitter hickory both are nouns.

Word	Noun	Adjective	Verb	Adverb
bitter pignut	Yes	No	No	No
bitter hickory	Yes	No	No	No

As nouns, bitter pignut and bitter hickory are synonyms defined as:

bitter pignut and bitter hickory: hickory of the eastern United States having a leaves with 7 or 9 leaflets and thin-shelled very bitter nuts

Other synonyms of bitter pignut include bitternut, bitternut hickory, Carya cordiformis, swamp hickory.

bitter pignut (noun)	bitter hickory (noun)
hickory of the eastern United States having a leaves with 7 or 9 leaflets and thin-shelled very bitter nuts	hickory of the eastern United States having a leaves with 7 or 9 leaflets and thin-shelled very bitter nuts