playhouse vs wendy house

playhouse and wendy house both are nouns.

Word	Noun	Adjective	Verb	Adverb
playhouse	Yes	No	No	No
wendy house	Yes	No	No	No

As nouns, playhouse and wendy house are synonyms defined as:

playhouse and wendy house: plaything consisting of a small model of a house that children can play inside of

playhouse (noun)	wendy house (noun)
plaything consisting of a small model of a house that children can play inside of	plaything consisting of a small model of a house that children can play inside of