diplomatic mission vs mission

diplomatic mission and mission both are nouns.

Word	Noun	Adjective	Verb	Adverb
diplomatic mission	Yes	No	No	No
mission	Yes	No	No	No

As nouns, mission is a hypernym of diplomatic mission; that is, mission is a word with a broader meaning than diplomatic mission:

Other hypernyms of diplomatic mission include commission, delegacy, delegation, deputation.

diplomatic mission (noun)	mission (noun)
a mission serving diplomatic ends	a special assignment that is given to a person or group
	an operation that is assigned by a higher headquarters
	the organized work of a religious missionary
	a group of representatives or delegates
	an organization of missionaries in a foreign land sent to carry on religious work