There are many synonyms for the phrase "free companion" that can vary depending on the context in which they are used. Some of the most commonly used synonyms include friend, partner, companion, ally, accomplice, confidant, cohort, comrade, associate, teammate, collaborator, and sidekick. These words all suggest a close relationship between two individuals who enjoy spending time together, sharing similar interests and a mutual understanding. Whether in a personal or professional setting, having a free companion can be incredibly beneficial in terms of emotional support, productivity, and success. Ultimately, the word chosen as a synonym depends on the specific situation and the intended meaning.