envoy vs diplomatist

envoy and diplomatist both are nouns.

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

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

Other hypernyms of envoy include diplomat.

envoy (noun)	diplomatist (noun)
a brief stanza concluding certain forms of poetry	an official engaged in international negotiations
a diplomat having less authority than an ambassador
someone sent on a mission to represent the interests of someone else