When it comes to synonyms for "room together", a number of options are available. To begin with, you may want to consider "cohabit", which refers to living or residing with someone. Additionally, "roommate" is a term frequently used to describe a person with whom one shares a living space. Alternatively, "housemate" is a synonym for "room together" that is also commonly used. Other options include "flatmate" or "apartment mate" depending on the type of living space being shared. In any case, all of these terms refer to individuals sharing living quarters and the responsibilities that come with it.