water chestnut vs Eleocharis dulcis

water chestnut and Eleocharis dulcis both are nouns.

Word	Noun	Adjective	Verb	Adverb
water chestnut	Yes	No	No	No
Eleocharis dulcis	Yes	No	No	No

As nouns, water chestnut and Eleocharis dulcis are synonyms defined as:

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

Other synonyms of water chestnut include Chinese water chestnut.

water chestnut (noun)	Eleocharis dulcis (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