tranquillity

As nouns the difference between calm and tranquillity

is that calm is (in a person) the state of being calm; peacefulness; absence of worry, anger, fear or other strong negative emotion while tranquillity is the state of being tranquil.

As an adjective calm

is (of a person) peaceful, quiet, especially free from anger and anxiety.

As a verb calm

is to make calm.

As nouns the difference between tranquillity and quiet

is that tranquillity is the state of being tranquil while quiet is the absence of sound; quietness.

As an adjective quiet is

with little or no sound; free from of disturbing noise.

As a verb quiet is

to become quiet, silent, still, tranquil, calm.

As nouns the difference between tranquillity and easefulness

is that tranquillity is the state of being tranquil while easefulness is state of being easeful, or a quality of promoting ease and tranquillity.