The difference between Illegal alien and Illegal immigrant
When used as nouns, illegal alien means a person who is within the boundaries of a political state without the authorization of the government of that state, whereas illegal immigrant means someone who has immigrated into a country by bypassing customs and immigration controls.
check bellow for the other definitions of Illegal alien and Illegal immigrant
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Illegal alien as a noun (sometimes, _, offensive):
A person who is within the boundaries of a political state without the authorization of the government of that state; a national of another country who has entered or stayed without permission.
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Illegal immigrant as a noun (countable, sometimes, _, offensive):
Someone who has immigrated into a country by bypassing customs and immigration controls.