Roomie vs. Roommate — What's the Difference?

A roommate.

A roommate is a person with whom one shares a living facility such as a room or dormitory except when being family or romantically involved. Similar terms include dormmate, suitemate, housemate, or flatmate ("flat": the usual term in British English for an apartment).

(informal) A roommate.

A person with whom one shares a room or rooms.

A person with whom one shares a room, as at university, etc.

A person (UK: flatmate, housemate, AU: sharemate) sharing the same home (sharehome).

A same-sex significant other with whom one lives; a coinhabitant in a non-heterosexual relationship.

One of two or more occupying the same room or rooms; one who shares the occupancy of a room or rooms; a chum.

An associate who shares a room with you