scold vs nag

scold and nag both are nouns.

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

As nouns, scold and nag are synonyms defined as:

scold and nag: someone (especially a woman) who annoys people by constantly finding fault

Other synonyms of scold include common scold, nagger, scolder.

scold (noun)	nag (noun)
someone (especially a woman) who annoys people by constantly finding fault	an old or over-worked horse
	someone (especially a woman) who annoys people by constantly finding fault

scold (verb)	nag (verb)
censure severely or angrily	remind or urge constantly
show one's unhappiness or critical attitude	bother persistently with trivial complaints
	worry persistently