foreign mission vs missionary post

foreign mission and missionary post both are nouns.

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

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

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

Other synonyms of foreign mission include mission, missionary station.

foreign mission (noun)	missionary post (noun)
an organization of missionaries in a foreign land sent to carry on religious work	an organization of missionaries in a foreign land sent to carry on religious work
a permanent diplomatic mission headed by a minister