(n.) One who instructs; one who imparts knowledge to another; a teacher.

Dutch uncle Polonius abecedarian academe academician admonisher adviser aeronaut aeroplaner aeroplanist air pilot airplanist assistant assistant professor associate associate professor astronaut aviator backseat driver barnstormer birdman buttinsky captain certified teacher cloud seeder coach commercial pilot confidant consultant copilot counsel counselor crop-duster docent doctor dominie don educationist educator emeritus expert fellow flier forerunner guide guru jet jockey kibitzer lecturer licensed pilot maestro master meddler melamed mentor mistress monitor mullah nestor orienter pandit pathfinder pedagogist pedagogue pilot preceptist preceptor preparationist preparator preparer professor professor emeritus pundit rabbi rainmaker reader retired professor scholastic schoolkeeper schoolmaster schoolteacher starets stunt flier stunt man teacher test pilot trailblazer trainer tutor visiting professor wingman