校長
こうちょう · kouchou · JLPT N4 · noun
principal
🏫 校長 = school (校) + head/chief (長): the head of the school
校 is the school in 学校 (gakkou), and 長 means chief, as in 社長 (company president) and 店長 (shop manager). Swap the first character to name the head of any organisation. Both vowels are long: kou-chou.