swamp hickory vs bitternut hickory

swamp hickory and bitternut hickory both are nouns.

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

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

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

swamp hickory (noun)	bitternut 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