pallbearer vs griever

pallbearer and griever both are nouns.

Word	Noun	Adjective	Verb	Adverb
pallbearer	Yes	No	No	No
griever	Yes	No	No	No

As nouns, griever is a hypernym of pallbearer; that is, griever is a word with a broader meaning than pallbearer:

pallbearer: one of the mourners carrying the coffin at a funeral
griever: a person who is feeling grief (as grieving over someone who has died)

Other hypernyms of pallbearer include lamenter, mourner, sorrower.

pallbearer (noun)	griever (noun)
one of the mourners carrying the coffin at a funeral	a person who is feeling grief (as grieving over someone who has died)