bitter pignut vs swamp hickory

bitter pignut and swamp hickory both are nouns.

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

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

bitter pignut and swamp 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 bitter hickory, bitternut, bitternut hickory, Carya cordiformis.

bitter pignut (noun)	swamp 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