playhouse vs plaything

playhouse and plaything both are nouns.

Word	Noun	Adjective	Verb	Adverb
playhouse	Yes	No	No	No
plaything	Yes	No	No	No

As nouns, plaything is a hypernym of playhouse; that is, plaything is a word with a broader meaning than playhouse:

playhouse: plaything consisting of a small model of a house that children can play inside of
plaything: an artifact designed to be played with

Other hypernyms of playhouse include toy.

playhouse (noun)	plaything (noun)
plaything consisting of a small model of a house that children can play inside of	an artifact designed to be played with