fiend vs ogre

fiend and ogre both are nouns.

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

As nouns, fiend and ogre are synonyms defined as:

Other synonyms of fiend include demon, devil, monster.

fiend (noun)	ogre (noun)
a cruel wicked and inhuman person	(folklore) a giant who likes to eat human beings
a person motivated by irrational enthusiasm (as for a cause)	a cruel wicked and inhuman person
an evil supernatural being