daimon vs fiend

daimon and fiend both are nouns.

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

As nouns, daimon and fiend are synonyms defined as:

Other synonyms of daimon include daemon, demon, devil.

daimon (noun)	fiend (noun)
an evil supernatural being	a cruel wicked and inhuman person
	a person motivated by irrational enthusiasm (as for a cause)
	an evil supernatural being