windlessness vs calmness

windlessness and calmness both are nouns.

Word	Noun	Adjective	Verb	Adverb
windlessness	Yes	No	No	No
calmness	Yes	No	No	No

As nouns, calmness is a hypernym of windlessness; that is, calmness is a word with a broader meaning than windlessness:

windlessness (noun)	calmness (noun)
calmness without winds	steadiness of mind under stress
	a feeling of calm; an absence of agitation or excitement
	an absence of strong winds or rain