nag vs disagreeable person

nag and disagreeable person both are nouns.

Word	Noun	Adjective	Verb	Adverb
nag	Yes	No	Yes	No
disagreeable person	Yes	No	No	No

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

nag: someone (especially a woman) who annoys people by constantly finding fault
disagreeable person: a person who is not pleasant or agreeable

Other hypernyms of nag include unpleasant person.

nag (noun)	disagreeable person (noun)
an old or over-worked horse	a person who is not pleasant or agreeable
someone (especially a woman) who annoys people by constantly finding fault

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