leader

pluralleaders

noun: a person who leads or commands a group, organization, or country
- After the election, the new leader promised to improve healthcare.
noun: the frontmost person in a line, procession, or formation
- She always volunteered to be the leader of the marching band.
noun: a person or thing that is the most successful or advanced in a particular area
- The company is a leader in the field of artificial intelligence.