The term 'fixed routine' can be broken down into three words: RUT (3 letters), ROTE (4 letters), and GROOVE (6 letters). RUT is defined as a habit or pattern of behavior that has become dull and unproductive. ROTE is defined as a memorized practice or procedure performed without thought or understanding. Finally, GROOVE is defined as a settled and established pattern of behavior. Together, these three words can be used to describe a fixed routine, which is a set of habits or procedures that are done in the same way each time.