water hickory vs water bitternut

water hickory and water bitternut both are nouns.

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

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

water hickory and water bitternut: hickory of southern United States having many narrow leaflets and rather bitter nuts

Other synonyms of water hickory include bitter pecan, Carya aquatica.

water hickory (noun)	water bitternut (noun)
hickory of southern United States having many narrow leaflets and rather bitter nuts	hickory of southern United States having many narrow leaflets and rather bitter nuts