The term 'Boss of Bosses' is a title given to someone who is in charge of a large organization or group. The three crossword solutions for this term are OVERLORD (8 letters), CEO (3 letters), and Headhoncho (10 letters). OVERLORD is a term used to describe someone who has absolute authority over a certain area or group. CEO stands for Chief Executive Officer, which is the highest ranking executive in a company or organization. Headhoncho is a slang term used to describe someone who is in charge of a particular group or organization.