Laputa vs imaginary place

Laputa and imaginary place both are nouns.

Word	Noun	Adjective	Verb	Adverb
Laputa	Yes	No	No	No
imaginary place	Yes	No	No	No

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

Laputa: a land imagined by Jonathan Swift where impractical projects were pursued and practical projects neglected
imaginary place: a place that exists only in imagination; a place said to exist in fictional or religious writings

Other hypernyms of Laputa include fictitious place, mythical place.

Laputa (noun)	imaginary place (noun)
a land imagined by Jonathan Swift where impractical projects were pursued and practical projects neglected	a place that exists only in imagination; a place said to exist in fictional or religious writings