Asgard vs imaginary place

Asgard and imaginary place both are nouns.

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

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

Asgard: (Norse mythology) the heavenly dwelling of the Norse gods (the Aesir) and slain war heroes
imaginary place: a place that exists only in imagination; a place said to exist in fictional or religious writings

Other hypernyms of Asgard include fictitious place, mythical place.

Asgard (noun)	imaginary place (noun)
(Norse mythology) the heavenly dwelling of the Norse gods (the Aesir) and slain war heroes	a place that exists only in imagination; a place said to exist in fictional or religious writings