The word "bosser" is slang that typically refers to someone who is a boss or a person in charge of others. There are various synonyms that can be used to describe these types of individuals, including 'manager', 'supervisor', 'administrator', 'leader', 'chief', 'commander', 'executive', 'director', 'foreman', and 'overseer', to name a few. Each of these words implies a different level of authority and responsibility, with some being more formal and professional than others. Whether you're describing your own boss or talking about someone you admire in a leadership position, there are many different words you can use to convey the same idea.