ogre vs demon

ogre and demon both are nouns.

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

As nouns, ogre and demon are synonyms defined as:

Other synonyms of ogre include devil, fiend, monster.

ogre (noun)	demon (noun)
(folklore) a giant who likes to eat human beings	an evil supernatural being
a cruel wicked and inhuman person	a cruel wicked and inhuman person
	someone extremely diligent or skillful