necropolis vs cemetery

necropolis and cemetery both are nouns.

Word	Noun	Adjective	Verb	Adverb
necropolis	Yes	No	No	No
cemetery	Yes	No	No	No

As nouns, necropolis and cemetery are synonyms defined as:

Other synonyms of necropolis include burial ground, burial site, burying ground, graveyard, memorial park.

necropolis (noun)	cemetery (noun)
a tract of land used for burials	a tract of land used for burials