noun
A person who provides guidance, instruction, or coaching in a structured setting such as a school, club, training program, or workplace.
彼は新入社員の指導員を務めている。
He serves as an instructor for new employees.
自動車学校の指導員はとても
The driving school instructor was very kind.
コーチ is a loanword for a sports or personal coach, often with a more informal or athletic connotation, whereas 指導員 is a broader term used in educational, corporate, and training contexts.
Compound of 指導 (しどう, 'guidance') and 員 (いん, 'member' or 'personnel'), literally 'guidance person'.