Führer

leader (someone who is ahead of others)
guidebook (text which provides information about a topic)
guide (person who assists people by providing information, giving directions, etc.)
leader (someone who determines the actions of a group)
director, manager, commander (person in charge of something or someone)
driver, pilot (someone who operates a vehicle of some sort)
fugue theme (melody in the form it appears in first in a fugue)
Führer (Adolf Hitler when he was the chancellor of Nazi Germany)

See also: