aberrant vs abnormal

aberrant is a noun but abnormal is not a noun.

Word	Noun	Adjective	Verb	Adverb
aberrant	Yes	Yes	No	No
abnormal	No	Yes	No	No

aberrant (noun)	abnormal (noun)
one whose behavior departs substantially from the norm of a group

aberrant (adjective)	abnormal (adjective)
markedly different from an accepted norm	not normal; not typical or usual or regular or conforming to a norm
	departing from the normal in e.g. intelligence and development
	much greater than the normal