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In some senses, roommate is marked as US, humorous, ironic. Watch for register when choosing this word.
roommate
UK /ˈɹu(m)ˌmeɪt/ US /ˈɹu(m)ˌmeɪt/
noun 3
Definitions
noun
1
A person with whom one shares a room, as in a dormitory, barracks, rooming house, or apartment.
2
A person sharing the same home albeit not the same room (but generally not a family member or spouse).
I live with Marsha. We’re roommates.
3
A same-sex significant other with whom one lives; a coinhabitant in a non-heterosexual relationship.
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