official emissary vs emissary

official emissary and emissary both are nouns.

Word	Noun	Adjective	Verb	Adverb
official emissary	Yes	No	No	No
emissary	Yes	No	No	No

As nouns, emissary is a hypernym of official emissary; that is, emissary is a word with a broader meaning than official emissary:

official emissary: a member of a legation
emissary: someone sent on a mission to represent the interests of someone else

Other hypernyms of official emissary include envoy.

official emissary (noun)	emissary (noun)
a member of a legation	someone sent on a mission to represent the interests of someone else