tutor
One who teaches another (usually called a ''student'', ''learner'', or ''tutee'') in a one-on-one or small-group interaction.
(UK) A university officer responsible for students in a particular hall.
(UK) A homeroom
(law) One who has the charge of a child or pupil and his estate; a guardian.
To instruct or teach, especially an individual or small group.
(archaic) To treat with authority or sternness.
(trading card games) A card that allows one to search one's deck for one or more other cards.
(trading card games) To fetch a card from one's deck.