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Playhouse
Childhood Imaginative
Associates 'playhouse' with imaginative activities where children often mimic adults or create fantasy worlds. 
Physical Toy
Specifies that 'playhouse' refers to a physical structure and not, for instance, a figurative concept. 
Not Always Literal
While typically a small structure, 'playhouse' can also describe any space a child plays in regularly, like a cardboard box. 