burial ground vs memorial park

burial ground and memorial park both are nouns.

Word	Noun	Adjective	Verb	Adverb
burial ground	Yes	No	No	No
memorial park	Yes	No	No	No

As nouns, burial ground and memorial park are synonyms defined as:

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

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