embassy vs mission

embassy and mission both are nouns.

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

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

Other hypernyms of embassy include commission, delegacy, delegation, deputation.

embassy (noun)	mission (noun)
a diplomatic building where ambassadors live or work	a special assignment that is given to a person or group
an ambassador and his entourage collectively	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