【Emigrant】 , 【immigrant】  are comparable but not interchangeable when denoting a person who leaves one country in order to settle in another.

【Emigrant】  (so also emigrate, emigration ) is used with reference to the country from which,  【immigrant】  (so also immigrate, immigration ) with reference to the country into which, migration is made. The former marks the going out from a country; the latter, the entrance into a country.

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