dolour vs heartache

dolour and heartache both are nouns.

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

As nouns, heartache is a hypernym of dolour; that is, heartache is a word with a broader meaning than dolour:

dolour: (poetry) painful grief
heartache: intense sorrow caused by loss of a loved one (especially by death)

Other hypernyms of dolour include brokenheartedness, grief, heartbreak.

dolour (noun)	heartache (noun)
(poetry) painful grief	intense sorrow caused by loss of a loved one (especially by death)