dreamworld vs fictitious place

dreamworld and fictitious place both are nouns.

Word	Noun	Adjective	Verb	Adverb
dreamworld	Yes	No	No	No
fictitious place	Yes	No	No	No

As nouns, fictitious place is a hypernym of dreamworld; that is, fictitious place is a word with a broader meaning than dreamworld:

dreamworld: a pleasing country existing only in dreams or imagination
fictitious place: a place that exists only in imagination; a place said to exist in fictional or religious writings

Other hypernyms of dreamworld include imaginary place, mythical place.

dreamworld (noun)	fictitious place (noun)
a pleasing country existing only in dreams or imagination	a place that exists only in imagination; a place said to exist in fictional or religious writings