stomate vs water stoma

stomate and water stoma both are nouns.

Word	Noun	Adjective	Verb	Adverb
stomate	Yes	No	No	No
water stoma	Yes	No	No	No

As nouns, water stoma is a hyponym of stomate; that is, water stoma is a word with a more specific, narrower meaning than stomate:

stomate: a minute epidermal pore in a leaf or stem through which gases and water vapor can pass
water stoma: a pore that exudes water on the surface or margin of a leaf of higher plants

Other hyponyms of stomate include germ pore, hydathode, water pore, lenticel.

stomate (noun)	water stoma (noun)
a minute epidermal pore in a leaf or stem through which gases and water vapor can pass	a pore that exudes water on the surface or margin of a leaf of higher plants