The term 'Ruler of Dubai' can be summarized by the crossword solution 'EMIR', which is a 4-letter word. An EMIR is a title of high rank or office, most commonly associated with Islamic countries. In the United Arab Emirates, the EMIR is the head of state and is responsible for the executive, legislative, and judicial branches of government. The current Ruler of Dubai is Sheikh Mohammed bin Rashid Al Maktoum, who has held the position since 2006.