stoma vs astomatal

stoma is a noun but astomatal is not a noun.

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

stoma (noun)	astomatal (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 minute epidermal pore in a leaf or stem through which gases and water vapor can pass

stoma (adjective)	astomatal (adjective)
	lacking a stoma or stomata