1) Co-worker: This is a more general term that simply refers to someone who works in the same place as you. It doesn't necessarily imply a close working relationship, but it can be used to describe anyone who shares your workplace. 2) Workmate: This term is similar to "co-worker," but it often suggests a more informal or friendly relationship. It's a term that might be used more commonly in casual settings or among younger people. 3) Partner: This term typically implies a closer working relationship, often involving shared responsibilities and a sense of mutual partnership. It might be used in a business context, where two people work together to run a company, or in a more casual setting, like a team project. 4) Colleague: This term is a bit more formal than "co-worker" or "workmate." It suggests a professional relationship, often involving people who work in the same field or industry. It's a term that might be used in academic or corporate settings. In English-speaking countries like Australia, people generally associate "partner" more with romantic relationships. While it can be used to refer to a business partner or a teammate, the primary connotation is romantic. If you want to refer to a business partner or a teammate in a more formal context, it's often more specific to use terms like "business partner," "colleague," or "teammate."