tutor

About 3.38 uses per million words.

Meaning

noun One who teaches another (usually called a student, learner, or tutee) in a one-on-one or small-group interaction.
He passed the difficult class with help from his tutor.
noun A university officer responsible for students in a particular hall.
noun A homeroom.
noun One who has the charge of a child or pupil and his estate; a guardian.
verb To instruct or teach, especially an individual or small group.
To help pay her tuition, the college student began to tutor high school students in calculus and physics.
verb To treat with authority or sternness.
noun A card that allows one to search one's deck for one or more other cards.
verb To fetch a card from one's deck.