lamenter vs pallbearer

lamenter and pallbearer both are nouns.

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

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

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

Other hyponyms of lamenter include bearer, wailer, weeper.

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