chieftain
noun /ˈtʃiːf.tən,ˈtʃif.tən,ˈtʃif.tin/
b) A leader of a group, e.g. a robbers chieftain.
Syn: chief,
big gun,
big shot,
big wheel,
bigwig,
boss,
employer,
foreman,
head, heid bummer,
leader,
mandarin,
manager,
mover and shaker,
top banana,
top dog,
tycoon
Wikipedia foundation.