griever vs lamenter

griever and lamenter both are nouns.

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

As nouns, griever and lamenter are synonyms defined as:

griever and lamenter: a person who is feeling grief (as grieving over someone who has died)

Other synonyms of griever include mourner, sorrower.

griever (noun)	lamenter (noun)
a person who is feeling grief (as grieving over someone who has died)	a person who is feeling grief (as grieving over someone who has died)