potentate
noun
[ ˈpəʊt(ə)nteɪt ]
• a monarch or ruler, especially an autocratic one.
Similar:
ruler,
head of state,
monarch,
sovereign,
king,
queen,
emperor,
empress,
prince,
tsar,
crowned head,
mogul,
dynast,
overlord,
leader,
Origin:
late Middle English: from Latin potentatus ‘dominion’, from potent- ‘being able or powerful’ (see potent1).
