abnormality vs slowness

abnormality and slowness both are nouns.

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

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

abnormality: retardation sufficient to fall outside the normal range of intelligence
slowness: lack of normal development of intellectual capacities

Other hypernyms of abnormality include backwardness, mental retardation, retardation, subnormality.

abnormality (noun)	slowness (noun)
behavior that breaches the rule or etiquette or custom or morality	a rate demonstrating an absence of haste or hurry
marked strangeness as a consequence of being abnormal	lack of normal development of intellectual capacities
retardation sufficient to fall outside the normal range of intelligence	unskillfulness resulting from a lack of training
an abnormal physical condition resulting from defective genes or developmental deficiencies