As nouns the difference between calmness and tranquility
is that calmness is the state of being calm; tranquillity; silence while tranquility is an alternative spelling of lang=en.
calmness
English
Noun
(uncountable) The state of being calm; tranquillity; silence.
(countable) The product of being calm.
Synonyms
* See also
Antonyms
* disturbance
tranquility
English
Noun
(en-noun)
Usage notes
* More common spelling in the US; less common in the UK.