foreign mission vs NGO

foreign mission and NGO both are nouns.

Word	Noun	Adjective	Verb	Adverb
foreign mission	Yes	No	No	No
NGO	Yes	No	No	No

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

foreign mission: an organization of missionaries in a foreign land sent to carry on religious work
NGO: an organization that is not part of the local or state or federal government

Other hypernyms of foreign mission include nongovernmental organization.

foreign mission (noun)	NGO (noun)
an organization of missionaries in a foreign land sent to carry on religious work	an organization that is not part of the local or state or federal government
a permanent diplomatic mission headed by a minister