inactiveness vs languor

inactiveness and languor both are nouns.

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

As nouns, languor is a hyponym of inactiveness; that is, languor is a word with a more specific, narrower meaning than inactiveness:

Other hyponyms of inactiveness include flatness, lethargy, phlegm, sluggishness, restfulness, passiveness, passivity, indolence, laziness.

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