aperture vs micropyle

aperture and micropyle both are nouns.

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

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

aperture: a natural opening in something
micropyle: minute opening in the wall of an ovule through which the pollen tube enters

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

aperture (noun)	micropyle (noun)
an man-made opening; usually small	minute opening in the wall of an ovule through which the pollen tube enters
a device that controls amount of light admitted
a natural opening in something