nuncio vs diplomat

nuncio and diplomat both are nouns.

Word	Noun	Adjective	Verb	Adverb
nuncio	Yes	No	No	No
diplomat	Yes	No	No	No

As nouns, diplomat is a hypernym of nuncio; that is, diplomat is a word with a broader meaning than nuncio:

nuncio: (Roman Catholic Church) a diplomatic representative of the Pope having ambassadorial status
diplomat: an official engaged in international negotiations

Other hypernyms of nuncio include diplomatist.

nuncio (noun)	diplomat (noun)
(Roman Catholic Church) a diplomatic representative of the Pope having ambassadorial status	an official engaged in international negotiations
	a person who deals tactfully with others