leisureliness vs slowness

leisureliness and slowness both are nouns.

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

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

Other hypernyms of leisureliness include deliberateness, deliberation, unhurriedness.

leisureliness (noun)	slowness (noun)
slowness by virtue of being leisurely	a rate demonstrating an absence of haste or hurry
	lack of normal development of intellectual capacities
	unskillfulness resulting from a lack of training