flatmate(a person with whom one shares a flat) noun [UK: ˈflæt.meɪt] [US: ˈflæt.meɪt]He's my flatmate. = Lui è il mio coinquilino.
housemate [housemates](someone living in the same house) noun [UK: ˈhaʊsmeɪt] [US: ˈhaʊsmeɪt]
roommate [roommates](US: with whom one shares an apartment or house) noun [UK: ˈruː.ˌmet] [US: ˈruː.ˌmet]John stole money from his roommate. = John ha rubato soldi al suo coinquilino.