Roommate, housemate, flatmate and bunkmate are some of the most common synonyms for the word "roomie". All of these terms are used to refer to a person who shares a living space with another individual. Roommate is the most common term among them, and refers to someone who shares a room with another person. Housemate, on the other hand, refers to someone who shares a house or apartment with another person. Flatmate is used more commonly in British English and refers to someone who shares a flat or apartment with another person. Bunkmate is primarily used in military or camping contexts, and refers to someone who shares a bunk or sleeping quarters with another person.