dormancy vs inactiveness

dormancy and inactiveness both are nouns.

Word	Noun	Adjective	Verb	Adverb
dormancy	Yes	No	No	No
inactiveness	Yes	No	No	No

As nouns, inactiveness is a hypernym of dormancy; that is, inactiveness is a word with a broader meaning than dormancy:

Other hypernyms of dormancy include inaction, inactivity.

dormancy (noun)	inactiveness (noun)
quiet and inactive restfulness	a disposition to remain inactive or inert
a state of quiet (but possibly temporary) inaction	the state of being inactive