apsis vs recess

apsis and recess both are nouns.

Word	Noun	Adjective	Verb	Adverb
apsis	Yes	No	No	No
recess	Yes	No	Yes	No

As nouns, recess is a hypernym of apsis; that is, recess is a word with a broader meaning than apsis:

apsis: a domed or vaulted recess or projection on a building especially the east end of a church; usually contains the altar
recess: an enclosure that is set back or indented

Other hypernyms of apsis include niche.

apsis (noun)	recess (noun)
a domed or vaulted recess or projection on a building especially the east end of a church; usually contains the altar	a pause from doing something (as work)
	an enclosure that is set back or indented
	an arm off of a larger body of water (often between rocky headlands)
	a small concavity
	a state of abeyance or suspended business