Mentor
Part of speech: verb
Definition: To act as someone's mentor
Part of speech: noun
Definition: A wise and trusted counselor or teacher
Tutor
Part of speech: noun
Definition: One who teaches another (usually called a student, learner, or tutee) in a one-on-one or small-group interaction.
Part of speech: verb
Definition: (transitive) To instruct or teach, especially to an individual or small group.