Czar
Czar (noun) means an emperor of Russia before the 1917 revolution; more generally, an autocratic ruler. Example: “Nicholas II was the last czar of Russia.”
How to use Czar
Learner’s notesIn plain EnglishHistorically, a Russian emperor; today, mostly used loosely for an official put in charge of one specific problem area.
Also spelled "tsar" — both spellings are correct, but "czar" is more common in American English for the informal "policy chief" sense.
Fill the gap
Can you complete this real example?
Nicholas II was the last _____ of Russia.
Etymology
From Russian tsar, ultimately from Latin Caesar — the same root that gives German "Kaiser."