Kindergartens (kindergartens), colleges (middle schools), universities (universities), graduate students (graduates), teachers (teachers), classrooms (classrooms) and classmates.
Meaning discrimination
Playground, stadium, gymnasium and stadium can all mean "playground".
Playground generally refers to an activity place attached to a school or park, and can also refer to an amusement park or a children's playground.
Stadium refers to an outdoor stadium with stands around it.
Gymnasium can be abbreviated as Gym, which refers to an indoor gymnasium, gym or sports ground that is not affected by the weather.
Court usually refers to a special court with a wall around it.