ADJ

born, natural
charismatic, effective, good, great, inspiring, inspired, visionary
undisputed
powerful, strong
weak
deputy
former
joint
local, national
opposition, parliamentary, party
Conservative, Labour, etc.
military, political, religious, spiritual
gang, guerrilla, nationalist, rebel
group, project, squadron, team
Discuss any problems with your team leader
business, church, civic, community, council, government, strike, student, (trade) union, youth
Business leaders have been in talks with the government
miners', teachers', etc.

VERB + LEADER

be appointed, become, be elected
appoint (sb), appoint sb as, choose (sb as), elect (sb), elect sb as, nominate (sb), nominate sb as

PHRASES

a leader of the Opposition

ADJ

undisputed
brand, market, world
The company is a world leader in electrical goods
championship, league, tournament

VERB + LEADER

overtake
aiming to overtake the market leaders within two years

PREP

behind the ~
ten points behind league leaders Manchester United
~ in
the undisputed leader in her field