coach, trainer ...

teacher, professor, lecturer, tutor, instructor, coach, trainer
A teacher usually works in a school• Do the children like their new teacher?
A professor is a teacher of the highest rank in a British university, and is a general term for a teacher in an American college.
Someone who teaches in a British university and who is not a professor is called a lecturer.
A tutor gives lessons to just one student or a small group of students, especially privately in their home or a student's home• a private tutor
An instructor is someone who helps people learn a sport or practical skill, such as driving, skiing, or swimming• a riding instructor
A coach is someone who helps a person or a team to improve in a sport• the school swimming coach
A trainer is someone who teaches people the skills they need for a job• a teacher trainer. It is also someone who teaches skills to animals• a racehorse trainer