dreamworld vs mythical place

dreamworld and mythical place both are nouns.

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

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

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

Other hypernyms of dreamworld include fictitious place, imaginary place.

dreamworld (noun)	mythical 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