recess vs columbarium

recess and columbarium both are nouns.

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

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

recess: an enclosure that is set back or indented
columbarium: a niche for a funeral urn containing the ashes of the cremated dead

Other hyponyms of recess include alcove, bay, apse, apsis, cinerarium, fireplace, hearth, open fireplace, mihrab.

recess (noun)	columbarium (noun)
a pause from doing something (as work)	a sepulchral vault or other structure having recesses in the walls to receive cinerary urns
an enclosure that is set back or indented	a niche for a funeral urn containing the ashes of the cremated dead
an arm off of a larger body of water (often between rocky headlands)	a birdhouse for pigeons
a small concavity
a state of abeyance or suspended business