Ruritania vs imaginary place

Ruritania and imaginary place both are nouns.

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

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

Ruritania: an imaginary kingdom in central Europe; often used as a scene for intrigue and romance
imaginary place: a place that exists only in imagination; a place said to exist in fictional or religious writings

Other hypernyms of Ruritania include fictitious place, mythical place.

Ruritania (noun)	imaginary place (noun)
an imaginary kingdom in central Europe; often used as a scene for intrigue and romance	a place that exists only in imagination; a place said to exist in fictional or religious writings