ROOMMATE
roommate, roomie, roomy
(noun) an associate who shares a room with you
Source: WordNet® 3.1
Etymology
Noun
roommate (plural roommates)
A person with whom one shares a room, as at university etc.
(US, AU, Canada) A person (UK: flatmate, housemate, AU: sharemate) sharing the same home (sharehome).
Synonyms
• (informal) roomie
• (US) flatmate, housemate
Anagrams
• room meat
Source: Wiktionary
Room"mate`, n.
Definition: One of twe or more occupying the same room or rooms; one who
shares the occupancy of a room or rooms; a chum.
Source: Webster’s Unabridged Dictionary 1913 Edition