i Register
In some senses, roommate is marked as US, humorous, ironic. Watch for register when choosing this word.
ADJ.
all, talkative, terrible
My talkative roommate never stops chatting, even when I'm trying to sleep.
VERB + ROOMMATE
became, give, spied, trouble
I spied my roommate eating the last slice of pizza that I was saving.
ROOMMATE + NOUN
barracks, chinese, noogie, paul, prodigal
My roommate Paul borrowed my laptop and never gave it back.
PREP.
about, from, on, with
I had a serious argument with my roommate about the dirty dishes in the kitchen sink.