calmness vs disposition

calmness and disposition both are nouns.

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

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

Other hypernyms of calmness include temperament.

calmness (noun)	disposition (noun)
steadiness of mind under stress	the act or means of getting rid of something
a feeling of calm; an absence of agitation or excitement	your usual mood
an absence of strong winds or rain	a natural or acquired habit or characteristic tendency in a person or thing
	an attitude of mind especially one that favors one alternative over others