water bitternut vs bitter pecan

water bitternut and bitter pecan both are nouns.

Word	Noun	Adjective	Verb	Adverb
water bitternut	Yes	No	No	No
bitter pecan	Yes	No	No	No

As nouns, water bitternut and bitter pecan are synonyms defined as:

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

Other synonyms of water bitternut include Carya aquatica, water hickory.

water bitternut (noun)	bitter pecan (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