burial site vs necropolis

burial site and necropolis both are nouns.

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

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

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

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