calmness vs feeling

calmness and feeling both are nouns.

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

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

calmness (noun)	feeling (noun)
steadiness of mind under stress	the experiencing of affective and emotional states
a feeling of calm; an absence of agitation or excitement	an intuitive understanding of something
an absence of strong winds or rain	a physical sensation that you experience
	the sensation produced by pressure receptors in the skin
	a vague idea in which some confidence is placed
	the general atmosphere of a place or situation and the effect that it has on people