Leadership:
1. the position or function of a leader, a person who guides or directs a group: He managed to maintain his leadership of the party despite heavy opposition. Synonyms: administration, management, directorship, control, governorship, stewardship, hegemony.
2. ability to lead: As early as sixth grade she displayed remarkable leadership potential. Synonyms: authoritativeness, influence, command, effectiveness; sway, clout.
3. an act or instance of leading; guidance; direction: They prospered under his strong leadership.
4. the leaders of a group: The union leadership agreed to arbitrate.
Leader:
1.a person or thing that leads.
2.a guiding or directing head, as of an army, movement, or political group.
3.Music .
a. a conductor or director, as of an orchestra, band, or chorus.
b.the player at the head of the first violins in an orchestra, the principal cornetist in a band, or the principal soprano in a chorus, to whom any incidental solos are usually assigned.