requiem vs lament

requiem and lament both are nouns.

Word	Noun	Adjective	Verb	Adverb
requiem	Yes	No	No	No
lament	Yes	No	Yes	No

As nouns, requiem and lament are synonyms defined as:

requiem and lament: a song or hymn of mourning composed or performed as a memorial to a dead person

Other synonyms of requiem include coronach, dirge, threnody.

requiem (noun)	lament (noun)
a song or hymn of mourning composed or performed as a memorial to a dead person	a mournful poem; a lament for the dead
	a song or hymn of mourning composed or performed as a memorial to a dead person
	a cry of sorrow and grief

requiem (verb)	lament (verb)
	regret strongly
	express grief verbally