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