abnormality vs unfamiliarity

abnormality and unfamiliarity both are nouns.

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

As nouns, unfamiliarity is a hypernym of abnormality; that is, unfamiliarity is a word with a broader meaning than abnormality:

Other hypernyms of abnormality include strangeness.

abnormality (noun)	unfamiliarity (noun)
behavior that breaches the rule or etiquette or custom or morality	unusualness as a consequence of not being well known
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