swamp hickory vs bitter hickory

swamp hickory and bitter hickory both are nouns.

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

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

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

swamp hickory (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