missionary post vs foreign mission

missionary post and foreign mission both are nouns.

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

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

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

Other synonyms of missionary post include mission, missionary station.

missionary post (noun)	foreign mission (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