necropolis vs burying ground

necropolis and burying ground both are nouns.

Word	Noun	Adjective	Verb	Adverb
necropolis	Yes	No	No	No
burying ground	Yes	No	No	No

As nouns, necropolis and burying ground are synonyms defined as:

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

necropolis (noun)	burying ground (noun)
a tract of land used for burials	a tract of land used for burials