Collocations for leader - noun

born, natural, true
charismatic, effective, good, great, inspirational, inspired, inspiring, visionary
accountable
We need to make our political leaders accountable.

undisputed
influential, key, powerful, prominent, strong, top
corrupt, weak
deputy (esp. AmE)
senior
Some of our senior leaders have been with the company all of their careers.

former
future
These young people will be the future leaders of our nation.

joint (esp. BrE)
majority, minority (both esp. AmE)
a former US Senate majority leader

elected
She is the elected leader of the group.

local, national, world
a meeting with world leaders at the G8 summit

congressional, opposition, parliamentary, party, Senate
Conservative, Democratic, Labour, Republican, etc.
military, political, religious, spiritual
Christian, Jewish, Muslim, etc.
gang, guerrilla, nationalist, rebel
group, project, squadron, team
Discuss any problems with your team leader.

business, church, civic, community, corporate, council (esp. BrE), government, industry, strike, student, tribal, union, youth
Business leaders have been in talks with the government.

miners', teachers', etc. (BrE)
civil rights
civil rights leader Martin Luther King

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

the leader of the Opposition (in the UK)
the leader of the pack
They are trying to figure out who will emerge as the leader of this pack.

undisputed
brand, global, market, world, worldwide
The company is a world leader in electrical goods.

championship (BrE), league, tournament
joint (esp. BrE)
Milner and Whyte remain joint leaders in the Player of the Year event.

early
The company was an early leader in global manufacturing.

overtake
We aim to overtake the market leaders within two years.

behind the leader
ten points behind league leaders

leader in
the undisputed leader in her field