grief vs dolour

grief and dolour both are nouns.

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

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

Other hyponyms of grief include dolor.

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