calmness vs temperament

calmness and temperament both are nouns.

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

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

Other hypernyms of calmness include disposition.

calmness (noun)	temperament (noun)
steadiness of mind under stress	an adjustment of the intervals (as in tuning a keyboard instrument) so that the scale can be used to play in different keys
a feeling of calm; an absence of agitation or excitement	your usual mood
an absence of strong winds or rain	excessive emotionalism or irritability and excitability (especially when displayed openly)