harridan vs nag

harridan and nag both are nouns.

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

As nouns, nag is a hypernym of harridan; that is, nag is a word with a broader meaning than harridan:

harridan: a scolding (even vicious) old woman
nag: someone (especially a woman) who annoys people by constantly finding fault

Other hypernyms of harridan include common scold, nagger, scold, scolder.

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

harridan (verb)	nag (verb)
	remind or urge constantly
	bother persistently with trivial complaints
	worry persistently