delusion vs freak out

delusion and freak out both are nouns.

Word	Noun	Adjective	Verb	Adverb
delusion	Yes	No	No	No
freak out	Yes	No	Yes	No

As nouns, freak out is a hyponym of delusion; that is, freak out is a word with a more specific, narrower meaning than delusion:

delusion: a mistaken or unfounded opinion or idea
freak out: a wild delusion (especially one induced by a hallucinogenic drug)

Other hyponyms of delusion include disorientation.

delusion (noun)	freak out (noun)
the act of deluding; deception by creating illusory ideas	a wild delusion (especially one induced by a hallucinogenic drug)
a mistaken or unfounded opinion or idea
(psychology) an erroneous belief that is held in the face of evidence to the contrary

delusion (verb)	freak out (verb)
	lose one's nerve