out-migration vs expatriation

out-migration and expatriation both are nouns.

Word	Noun	Adjective	Verb	Adverb
out-migration	Yes	No	No	No
expatriation	Yes	No	No	No

As nouns, out-migration and expatriation are synonyms defined as:

out-migration and expatriation: migration from a place (especially migration from your native country in order to settle in another)

Other synonyms of out-migration include emigration.

out-migration (noun)	expatriation (noun)
migration from a place (especially migration from your native country in order to settle in another)	the act of expelling a person from their native land
	migration from a place (especially migration from your native country in order to settle in another)