cemetery vs necropolis

cemetery and necropolis both are nouns.

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

As nouns, cemetery and necropolis are synonyms defined as:

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

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