otherworld vs abstract entity

otherworld and abstract entity both are nouns.

Word	Noun	Adjective	Verb	Adverb
otherworld	Yes	No	No	No
abstract entity	Yes	No	No	No

As nouns, abstract entity is a hypernym of otherworld; that is, abstract entity is a word with a broader meaning than otherworld:

otherworld: an abstract spiritual world beyond earthly reality
abstract entity: a general concept formed by extracting common features from specific examples

Other hypernyms of otherworld include abstraction.

otherworld (noun)	abstract entity (noun)
an abstract spiritual world beyond earthly reality	a general concept formed by extracting common features from specific examples