quietude vs heartsease

quietude and heartsease both are nouns.

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

As nouns, heartsease is a hyponym of quietude; that is, heartsease is a word with a more specific, narrower meaning than quietude:

Other hyponyms of quietude include ataraxis, peace, peace of mind, peacefulness, repose, serenity, easiness, relaxation.

quietude (noun)	heartsease (noun)
a state of peace and quiet	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