mission vs missionary post

mission and missionary post both are nouns.

Word	Noun	Adjective	Verb	Adverb
mission	Yes	No	No	No
missionary post	Yes	No	No	No

As nouns, mission and missionary post are synonyms defined as:

mission and missionary post: an organization of missionaries in a foreign land sent to carry on religious work

Other synonyms of mission include foreign mission, missionary station.

mission (noun)	missionary post (noun)
a special assignment that is given to a person or group	an organization of missionaries in a foreign land sent to carry on religious work
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