stoma vs hydathode

stoma and hydathode both are nouns.

Word	Noun	Adjective	Verb	Adverb
stoma	Yes	No	No	No
hydathode	Yes	No	No	No

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

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

Other hyponyms of stoma include germ pore, water pore, water stoma, lenticel.

stoma (noun)	hydathode (noun)
a mouth or mouthlike opening (especially one created by surgery on the surface of the body to create an opening to an internal organ)	a pore that exudes water on the surface or margin of a leaf of higher plants
a minute epidermal pore in a leaf or stem through which gases and water vapor can pass