nuncio vs diplomatist

nuncio and diplomatist both are nouns.

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

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

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

Other hypernyms of nuncio include diplomat.

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