The antonyms for the phrase "being head of" are many, and they mostly depend on the context in which the phrase is used. If it refers to an organization or institution, some antonyms would be "employee," "member," or "volunteer." For example, instead of being the head of a company, one could be an employee or a member of that company. Conversely, if the phrase is used to refer to a family, some antonyms would be "child," "spouse," or "sibling." In the case of a group, such as a committee or a club, antonyms for "being head of" would be "member," "participant," or "follower." Ultimately, the antonyms for "being head of" depend on the specific situation in which it is used.