dollhouse vs doll's house

dollhouse and doll's house both are nouns.

Word	Noun	Adjective	Verb	Adverb
dollhouse	Yes	No	No	No
doll's house	Yes	No	No	No

As nouns, dollhouse and doll's house are synonyms defined as:

dollhouse and doll's house: a small model of a house used as a toy by children

As nouns, dollhouse and doll's house are synonyms defined as:

dollhouse and doll's house: a house so small that it is likened to a child's plaything

dollhouse (noun)	doll's house (noun)
a small model of a house used as a toy by children	a small model of a house used as a toy by children
a house so small that it is likened to a child's plaything	a house so small that it is likened to a child's plaything