burying ground vs necropolis

burying ground and necropolis both are nouns.

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

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

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

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