dybbuk vs fiend

dybbuk and fiend both are nouns.

Word	Noun	Adjective	Verb	Adverb
dybbuk	Yes	No	No	No
fiend	Yes	No	No	No

As nouns, fiend is a hypernym of dybbuk; that is, fiend is a word with a broader meaning than dybbuk:

dybbuk: (Jewish folklore) a demon that enters the body of a living person and controls that body's behavior
fiend: an evil supernatural being

Other hypernyms of dybbuk include daemon, daimon, demon, devil.

dybbuk (noun)	fiend (noun)
(Jewish folklore) a demon that enters the body of a living person and controls that body's behavior	a cruel wicked and inhuman person
	a person motivated by irrational enthusiasm (as for a cause)
	an evil supernatural being