au pair(n = noun.person) - a young foreigner who lives with a family in return for doing light housework;
is a kind of alien, foreigner, noncitizen, outlander
has particulars: au pair girl

au pair, n. a young foreign person, esp. a woman, helping with housework etc. in exchange for room, board, and pocket money, esp. as a means of learning a language.

Etymology:
F

au, au courant, au fait, au fond, au gratin, au jus, au naturel, au pair girl, au revoir, baba au rhum, base pair, cafe au lait, coq au vin, pair, pair creation, pair formation, pair of pincers, pair of pliers, pair of scissors, pair of tongs, pair of tweezers, pair of virginals, pair off, pair production, steak au poivre, thermoelectric pair