Mentha aquatica vs water mint

Mentha aquatica and water mint both are nouns.

Word	Noun	Adjective	Verb	Adverb
Mentha aquatica	Yes	No	No	No
water mint	Yes	No	No	No

As nouns, Mentha aquatica and water mint are synonyms defined as:

Mentha aquatica and water mint: a European mint that thrives in wet places; has a perfume like that of the bergamot orange; naturalized in eastern North America

Other synonyms of Mentha aquatica include water-mint.

Mentha aquatica (noun)	water mint (noun)
a European mint that thrives in wet places; has a perfume like that of the bergamot orange; naturalized in eastern North America	a European mint that thrives in wet places; has a perfume like that of the bergamot orange; naturalized in eastern North America