roommate
/ˈɹumˌmeɪt/noun
Someone you share a room or living space with, for example in a dormitory or apartment.
Example sentences
- “My roommate and I take turns doing the dishes.”
- “My new roommate plays guitar until midnight every night.”
American; British English says 'flatmate' or 'housemate', and there 'roommate' implies actually sharing the same room.