lament vs complain

lament is a noun but complain is not a noun.

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

As verbs, complain is a hypernym of lament; that is, complain is a word with a broader meaning than lament:

Other hypernyms of lament include kick, kvetch, plain, quetch, sound off.

lament (noun)	complain (noun)
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

lament (verb)	complain (verb)
regret strongly	express complaints, discontent, displeasure, or unhappiness
express grief verbally	make a formal accusation; bring a formal charge