教師

1. Origins, structure, and basic meaning

• Structure: 教師(きょうし) names a person whose profession is teaching students knowledge or skills.
• Basic usage: It refers to a person who teaches a particular subject or guides students at school, and to that profession.

2. Common pitfalls and similar expressions

• Profession and form of address
  • 教師 describes a profession; when addressing a teacher directly, people generally use 先生.
  • 先生 is also a title for people such as doctors, so the two words do not have identical scope.
• Occupational をしている
  • 教師をしている means working as a teacher. Here, をしている describes an occupation or role.