cesspool vs cistern

cesspool and cistern both are nouns.

Word	Noun	Adjective	Verb	Adverb
cesspool	Yes	No	No	No
cistern	Yes	No	No	No

As nouns, cistern is a hypernym of cesspool; that is, cistern is a word with a broader meaning than cesspool:

cesspool: a covered cistern; waste water and sewage flow into it
cistern: an artificial reservoir for storing liquids; especially an underground tank for storing rainwater

cesspool (noun)	cistern (noun)
a covered cistern; waste water and sewage flow into it	an artificial reservoir for storing liquids; especially an underground tank for storing rainwater
	a tank that holds the water used to flush a toilet
	a sac or cavity containing fluid especially lymph or cerebrospinal fluid