Is the term Professor only use for instructors who teach at an university?

Question

I say no, but my friend says yes.

What say you?

Answer 1

it is pretty much reserved for university instructors however i have head the terms used interchangably

teachers teach; professors profess



university instructors are usually just skilled in their field, not in how to best relay the information to their students

Answer 2

I think senior doctors (i.e. hospital doctors) can use it, too, but maybe thay have to teach student doctors to use the term.