remind vs nag

remind is not a noun while nag is a noun.

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

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

Other hyponyms of remind include take back, commemorate, immortalise, immortalize, memorialise, memorialize.

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

remind (verb)	nag (verb)
put in the mind of someone	remind or urge constantly
assist (somebody acting or reciting) by suggesting the next words of something forgotten or imperfectly learned	bother persistently with trivial complaints
	worry persistently