The term "co-oker" refers to a person who cooks together with another person. However, there are other words that can be used as synonyms to describe this activity. For example, a "culinary partner" refers to someone who shares the cooking duties and collaborates in the kitchen. Another term that can be used is "co-chef," which implies a shared responsibility for the cooking process. Additionally, "cooking companion" or "kitchen buddy" both suggest a collaborative effort in meal preparation. Finally, the term "cookmate" is also an appropriate synonym for "co-oker," and reflects the camaraderie and teamwork involved in cooking with another person.