apsis vs tribune

apsis and tribune both are nouns.

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

As nouns, tribune is a hyponym of apsis; that is, tribune is a word with a more specific, narrower 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
tribune: the apse of a Christian church that contains the bishop's throne

apsis (noun)	tribune (noun)
a domed or vaulted recess or projection on a building especially the east end of a church; usually contains the altar	the apse of a Christian church that contains the bishop's throne
	(ancient Rome) an official elected by the plebeians to protect their interests