助手

1. Origins, structure, and basic meaning

• Structure: 助手(じょしゅ) is a person who assists someone with their work or a specialized task.
• Basic usage: It describes the professor's assistant preparing laboratory equipment.
  • 教授の助手が実験器具を準備した。

2. Common pitfalls and similar expressions

• A person and an action
  • 助手 identifies an assistant, whereas 手伝い(てつだい) can refer either to the act of helping or to a person who helps.
• The word for the passenger seat
  • 助手席(じょしゅせき) is the seat beside the driver's seat. Its occupant need not be an assistant by occupation.