WordNet sense 1 (a leader in a political party who controls votes and dictates appointments):

party boss, political boss

WordNet sense 2 (a person who exercises control over workers):

chief, foreman, gaffer, honcho

WordNet sense 3 (a person responsible for hiring workers):

hirer

WordNet sense 4 (a circular rounded projection or protuberance):

knob

WordNet sense 5 (exceptionally good):

brag

WordNet sense 6 (raise in a relief):

emboss, stamp