serenity

As nouns the difference between ecstacy and serenity

is that ecstacy is obsolete spelling of lang=en while serenity is the state of being serene; calmness; peacefulness.

As a proper noun Serenity is

{{given name|female|from=English}} in general use since the 1990s.

As a proper noun serenity is

in general use since the 1990s.

As nouns the difference between serenity and reliability

is that serenity is the state of being serene; calmness; peacefulness while reliability is the quality of being reliable, dependable, or trustworthy.

As a proper noun Serenity

is {{given name|female|from=English}} in general use since the 1990s.

As a proper noun serenity

is in general use since the 1990s.

As an adjective happy is

experiencing the effect of favourable fortune; having the feeling arising from the consciousness of well-being or of enjoyment; enjoying good of any kind, as peace, tranquillity, comfort; contented; joyous.

As nouns the difference between serenity and calm

is that serenity is the state of being serene; calmness; peacefulness while calm is the state of being calm; peacefulness; absence of worry, anger, fear or other strong negative emotion.

As a proper noun Serenity

is {{given name|female|from=English}} in general use since the 1990s.

As an adjective calm is

peaceful, quiet, especially free from anger and anxiety.

As a verb calm is

to make calm.

As a noun taxonomy

is the science or the technique used to make a classification.

As a proper noun serenity is

in general use since the 1990s.

Tranqulity is likely misspelled.

Tranqulity has no English definition.

As a noun serenity

is the state of being serene; calmness; peacefulness.

As a proper noun Serenity

is {{given name|female|from=English}} in general use since the 1990s.

As nouns the difference between stillness and serenity

is that stillness is the quality or state of being still; quietness; silence; calmness; inactivity while serenity is the state of being serene; calmness; peacefulness.

As a proper noun Serenity is

{{given name|female|from=English}} in general use since the 1990s.

As a proper noun serenity

is in general use since the 1990s.

As a noun sobriety is

the quality or state of being sober.