embassador vs diplomatist

embassador and diplomatist both are nouns.

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

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

embassador: a diplomat of the highest rank; accredited as representative from one country to another
diplomatist: an official engaged in international negotiations

Other hypernyms of embassador include diplomat.

embassador (noun)	diplomatist (noun)
a diplomat of the highest rank; accredited as representative from one country to another	an official engaged in international negotiations