The term 'COMMONER' in ancient Rome can be described by two crossword solutions: PLEBEIAN (8 letters) and Plebian (7 letters). PLEBEIAN and Plebian were terms used to describe the lower class citizens of Rome, who were not part of the ruling class. They were often referred to as the 'plebs' and were excluded from political power and decision making. The terms are still used today to refer to people of lower social standing.