complain vs scold

complain is not a noun while scold is a noun.

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

As verbs, scold is a hyponym of complain; that is, scold is a word with a more specific, narrower meaning than complain:

complain (noun)	scold (noun)
	someone (especially a woman) who annoys people by constantly finding fault

complain (verb)	scold (verb)
express complaints, discontent, displeasure, or unhappiness	censure severely or angrily
make a formal accusation; bring a formal charge	show one's unhappiness or critical attitude