The term TYPE OF TEACHER can refer to a GYM teacher, which is a 3 letter word. A GYM teacher is an educator who specializes in physical education and teaches students about physical fitness, sports, and health. They typically work in elementary, middle, and high schools, and may also teach in colleges and universities. GYM teachers are responsible for developing and implementing physical education curriculums, as well as teaching students how to safely participate in physical activities.