- 선생님 - teacher. Has a sense of respect (a teacher is generally respected). - 교사 - a dry word referring to teacher as a profession (not used much in daily life). - 선생 (without 님): similar to 교사 but more common. Sometimes used derogatorily. (the above words usually refer to teachers at a grade or high school) - 교수, 교수님: professor (at a college or university)

선생님 - teacher 교수님 - professor :)

선생님*