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% replaces any number of letters (la% - lake, lamp)_ replaces one letter (ca_ - car, cat)

Crossword clues for Genghis Khan was one. 6 letters:

MONGOL: Genghis Khan was one.
MONGOL: Genghis Khan, for one
TATAR: Genghis Khan was one
BRUTE: Genghis Khan, for one
POLOGROUNDS: Mongolia's Genghis Khan Club, for one
TATAR: One subdued by Genghis Khan
UNICORN: Genghis Khan reportedly decided not to conquer India after meeting one on a mountaintop