serenity vs heartsease

serenity and heartsease both are nouns.

Word	Noun	Adjective	Verb	Adverb
serenity	Yes	No	No	No
heartsease	Yes	No	No	No

As nouns, serenity and heartsease are synonyms defined as:

Other synonyms of serenity include ataraxis, peace, peace of mind, peacefulness, repose.

serenity (noun)	heartsease (noun)
a disposition free from stress or emotion	the absence of mental stress or anxiety
the absence of mental stress or anxiety	common Old World viola with creamy often violet-tinged flowers
	violet of Pacific coast of North America having white petals tinged with yellow and deep violet
	a common and long cultivated European herb from which most common garden pansies are derived