burial ground vs necropolis

burial ground and necropolis both are nouns.

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

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

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

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