The term 'Rhinoceros Playwright' refers to the Romanian-French playwright Eugene Ionesco, who is best known for his absurdist plays such as Rhinoceros. His last name is often shortened to Ionesco (7 letters) or Ioneso (6 letters), and his full name is Eugene Ionesco (13 letters). He was a major figure in the Theatre of the Absurd movement, which sought to challenge traditional theatrical conventions and explore the meaninglessness of life.