aperture vs stoma

aperture and stoma both are nouns.

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

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

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

Other hyponyms of aperture include pupil, micropyle, pore, stomate.

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