The term 'PACK LEADER' is composed of three words: ALPHA (5 letters), SIX (3 letters), and PACER (5 letters). Alpha is a term used to refer to the leader of a group, usually the most dominant individual. Six is a number that can represent authority or leadership. PACER is someone who sets the pace for a group, often leading the way. Together, these three words form the phrase 'pack leader, ' which refers to an individual who leads a group of people or animals.