limbo vs fictitious place

limbo and fictitious place both are nouns.

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

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

limbo: (theology) in Roman Catholicism, the place of unbaptized but innocent or righteous souls (such as infants and virtuous individuals)
fictitious place: a place that exists only in imagination; a place said to exist in fictional or religious writings

Other hypernyms of limbo include imaginary place, mythical place.

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

limbo: an imaginary place for lost or neglected things
fictitious place: a place that exists only in imagination; a place said to exist in fictional or religious writings

Other hypernyms of limbo include imaginary place, mythical place.

limbo (noun)	fictitious place (noun)
(theology) in Roman Catholicism, the place of unbaptized but innocent or righteous souls (such as infants and virtuous individuals)	a place that exists only in imagination; a place said to exist in fictional or religious writings
an imaginary place for lost or neglected things
the state of being disregarded or forgotten