burial ground vs burial site

burial ground and burial site both are nouns.

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

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

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

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