pallbearer vs sorrower

pallbearer and sorrower both are nouns.

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

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

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

Other hypernyms of pallbearer include griever, lamenter, mourner.

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