diplomatist vs envoy

diplomatist and envoy both are nouns.

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

As nouns, envoy is a hyponym of diplomatist; that is, envoy is a word with a more specific, narrower meaning than diplomatist:

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