olemus
Wiktionary:
1. one who teaches another (usually called a student, learner, or tutee) in a one-on-one or small-group interaction

ISO/IEC 2382-36:
õppijat abistav inimene või IT-süsteem
= person or IT system that helps a learner

ülevaateid
https://en.wikipedia.org/wiki/Tutoring
https://guruathome.org/blog/different-types-of-tutors/
https://blog.gopeer.org/12-types-of-tutors-4162f8339299