languor vs inactiveness

languor and inactiveness both are nouns.

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

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

Other hypernyms of languor include inactivity, inertia.

languor (noun)	inactiveness (noun)
inactivity; showing an unusual lack of energy	a disposition to remain inactive or inert
a relaxed comfortable feeling	the state of being inactive
a feeling of lack of interest or energy
oppressively still air