heartache vs heartbreak

heartache and heartbreak both are nouns.

Word	Noun	Adjective	Verb	Adverb
heartache	Yes	No	No	No
heartbreak	Yes	No	No	No

As nouns, heartache and heartbreak are synonyms defined as:

heartache and heartbreak: intense sorrow caused by loss of a loved one (especially by death)

Other synonyms of heartache include brokenheartedness, grief.

heartache (noun)	heartbreak (noun)
intense sorrow caused by loss of a loved one (especially by death)	intense sorrow caused by loss of a loved one (especially by death)