Sultan vs. King: What's the ?

sultan kingSheikh Sultan bin Muhammad Al-Qasimi (Arabic: سلطان بن محمد القاسمي, romanized: Sulṭān bin Muḥammad al-Qāsimī; born 2 July 1939) is an Emirati politician, author, historian, andThe sultan was also referred to as the padishah (Ottoman Turkish: پادشاه, romanized: pâdişâh, French: Padichah).In Ottoman usage the word Padisha was usually used except sultan