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.

• A lecturer  is someone who teaches in a British university and who is not a professor

• .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