noun

• (historical) The holder of a secular office, formally subordinate to, but de facto the power behind the throne of, the caliph.
• 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.
• (card games, uncountable) A variant of solitaire, played with two decks of cards.
• A breed of chicken originating in Turkey, kept primarily in gardens for ornamental reasons. See: sultan (chicken)
• A surname.
• A glacier in Antarctica
• A village in Azerbaijan
• A coastal town in Libya
• An unincorporated community in Ontario
• A town, village and mountain range in Turkey
• A city and river in Washington