teacher

teacher
teach‧er S1 W1 /ˈtiːtʃə $ -ər/ noun [countable]
someone whose job is to teach, especially in a school:
    a primary school teacher
    language/history/science etc teacher
    teacher training/education (=professional training to become a teacher)
     

THESAURUS

   ▪ teacher someone who teaches as their job, especially in a school: a high school teacher
   ▪ principal (also headteacher British English) the teacher who is in charge of a school or college: The teacher sent him to the principal’s office.
   ▪ tutor someone who gives private lessons to one student or a small group of students. In Britain, a tutor is also a teacher in a university: They hired a tutor to help him with his English. | Your tutor will help you find a subject for your essay.
   ▪ lecturer someone who teaches in a university or college: University lecturers aren’t very well paid.
   ▪ professor a teacher in a college or university. In Britain, a professor is a high-ranking university teacher, especially one who is head of a department: She was professor of linguistics at Cambridge University.
   ▪ instructor someone who teaches a sport or a practical skill such as swimming or driving: He works as a ski instructor in the winter. | a driving instructor
   ▪ coach someone who helps a person or team improve in a sport: a professional tennis coach
   ▪ educator especially American English formal someone whose job involves teaching people, or someone who is an expert on education: Most educators agree that class sizes are still too big.
   ▪ trainer someone who teaches people particular skills, especially the skills they need to do a job: a teacher trainer | Many companies pay outside trainers to teach management skills to their staff.
   ▪ governess a woman who lived with a family and taught their children in past times: As a governess, Charlotte Brontë received twenty pounds a year.