heartache vs grief

heartache and grief both are nouns.

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

As nouns, heartache and grief are synonyms defined as:

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

Other synonyms of heartache include brokenheartedness, heartbreak.

heartache (noun)	grief (noun)
intense sorrow caused by loss of a loved one (especially by death)	something that causes great unhappiness
	intense sorrow caused by loss of a loved one (especially by death)