Living together is a phrase that often refers to two individuals who share a residence and household without being married. However, there are many synonyms for this phrase that can be used to better describe the nature of the relationship. Some synonyms include cohabitating, domestic partnership, shacking up, housemates, significant others, common law marriage, roommates, and companions. Each of these synonyms brings a slightly different connotation to the idea of living together, from a casual living arrangement to a more committed relationship. Depending on the context of the situation, choosing the right synonym will help convey the nuances of the relationship accurately.