instructor

noun

1. One who instructs; a teacher.

   “According to the National Centre for Education Statistics' most recent numbers (2012), 50% of instructors at degree-granting institutions in the US are part-time. […] Through teaching as an adjunct instructor while still a graduate student, I've had the luxury of developing my career: testing out teaching strategies, exploring innovative courses, and developing relationships with students – all while working on my dissertation.”