cemetery vs burial ground

cemetery and burial ground both are nouns.

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

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

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

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