stoma vs aperture

stoma and aperture both are nouns.

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

As nouns, aperture is a hypernym of stoma; that is, aperture is a word with a broader meaning than stoma:

stoma: a minute epidermal pore in a leaf or stem through which gases and water vapor can pass
aperture: a natural opening in something

stoma (noun)	aperture (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)	an man-made opening; usually small
a minute epidermal pore in a leaf or stem through which gases and water vapor can pass	a device that controls amount of light admitted
	a natural opening in something