playroom vs rumpus room

playroom and rumpus room both are nouns.

Word	Noun	Adjective	Verb	Adverb
playroom	Yes	No	No	No
rumpus room	Yes	No	No	No

As nouns, playroom and rumpus room are synonyms defined as:

playroom and rumpus room: a recreation room for noisy activities (parties or children's play etc)

Other synonyms of playroom include game room.

playroom (noun)	rumpus room (noun)
a recreation room for noisy activities (parties or children's play etc)	a recreation room for noisy activities (parties or children's play etc)