graveyard vs memorial park

graveyard and memorial park both are nouns.

Word	Noun	Adjective	Verb	Adverb
graveyard	Yes	No	No	No
memorial park	Yes	No	No	No

As nouns, graveyard and memorial park are synonyms defined as:

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

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