heartbreak vs heartache

heartbreak and heartache both are nouns.

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

As nouns, heartbreak and heartache are synonyms defined as:

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

Other synonyms of heartbreak include brokenheartedness, grief.

heartbreak (noun)	heartache (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)