burial site vs memorial park

burial site and memorial park both are nouns.

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

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

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

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