abnormality vs abnormal

abnormality is a noun but abnormal is not a noun.

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

abnormality (noun)	abnormal (noun)
behavior that breaches the rule or etiquette or custom or morality
marked strangeness as a consequence of being abnormal
retardation sufficient to fall outside the normal range of intelligence
an abnormal physical condition resulting from defective genes or developmental deficiencies

abnormality (adjective)	abnormal (adjective)
	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