'warlord' definitions:

Definition of 'warlord'

(from WordNet)

noun

Supreme military leader exercising civil power in a region especially one accountable to nobody when the central government is weak

Synonyms of 'warlord'

From: Moby Thesaurus

absolute monarch,
absolute ruler,
all-powerful ruler,
arrogator,
autarch,
autocrat,
caesar,
commissar,
czar,
despot,
dictator,
disciplinarian,
driver,
duce,
hard master,
martinet,
oligarch,
oppressor,
pharaoh,
Simon Legree,
slave driver,
stickler,
tyrant,
usurper

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