water chestnut vs Chinese water chestnut

water chestnut and Chinese water chestnut both are nouns.

Word	Noun	Adjective	Verb	Adverb
water chestnut	Yes	No	No	No
Chinese water chestnut	Yes	No	No	No

As nouns, water chestnut and Chinese water chestnut are synonyms defined as:

water chestnut and Chinese water chestnut: Chinese sedge yielding edible bulb-shaped tubers

Other synonyms of water chestnut include Eleocharis dulcis.

water chestnut (noun)	Chinese water chestnut (noun)
edible bulbous tuber of a Chinese marsh plant	Chinese sedge yielding edible bulb-shaped tubers
Chinese sedge yielding edible bulb-shaped tubers
a plant of the genus Trapa bearing spiny four-pronged edible nutlike fruits