cinerarium vs niche

cinerarium and niche both are nouns.

Word	Noun	Adjective	Verb	Adverb
cinerarium	Yes	No	No	No
niche	Yes	No	No	No

As nouns, niche is a hypernym of cinerarium; that is, niche is a word with a broader meaning than cinerarium:

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

Other hypernyms of cinerarium include recess.

cinerarium (noun)	niche (noun)
a niche for a funeral urn containing the ashes of the cremated dead	an enclosure that is set back or indented
	a small concavity
	a position particularly well suited to the person who or organization which occupies it
	(ecology) the status of an organism within its environment and community (affecting its survival as a species)