doldrums vs inactiveness

doldrums and inactiveness both are nouns.

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

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

Other hypernyms of doldrums include inaction, inactivity.

doldrums (noun)	inactiveness (noun)
a belt of calms and light winds between the northern and southern trade winds of the Atlantic and Pacific	a disposition to remain inactive or inert
a state of inactivity (in business or art etc)	the state of being inactive