sultan vs sultana

sultan

noun
  • A hereditary ruler in various Muslim states (sultanate), varying from petty principalities (as in Yemen), often vassal of a greater ruler, to independent realms, such as Oman, Brunei, Morocco (until 1956) or an empire such as the Turkish Ottoman Empire. 

  • The holder of a secular office, formally subordinate to, but de facto the power behind the throne of, the caliph. 

  • A breed of chicken originating in Turkey, kept primarily in gardens for ornamental reasons. See: sultan (chicken) 

  • A variant of solitaire, played with two decks of cards. 

sultana

noun
  • A female ruler of a sultanate. 

  • An old form of necklace. 

  • A pale yellow raisin made from a seedless grape. 

  • A type of viol, a cither viol. 

  • A wife or mistress of a sultan. 

How often have the words sultan and sultana occurred in a corpus of books? (source: Google Ngram Viewer )