phantasy world

English Thesaurus

1. something existing solely in the imagination (but often mistaken for reality) (noun.cognition)

hypernym	:	fantasy, phantasy,
definition	:	imagination unrestricted by reality (noun.cognition)

hyponym	:	paracosm,
definition	:	a prolonged fantasy world invented by children; can have a definite geography and language and history (noun.cognition)