supervisor in Kanji

Because the role differs slightly depending on the industry, and because it is neither a job title nor an occupation, in Japan it is often treated only in terms of atmosphere.
And in Japan, it is often written as “スーパーバイザー” in katakana notation.
A supervisor is responsible for:

• A person with the official task of overseeing the work of a person or group, or of other operations and activities. [management]
• A person who monitors someone to make sure they comply with rules or other requirements set for them.
• In certain states, an elected member of the governing body for a county which is called the board of supervisors. [US]
• A process responsible for managing other processes. [computing]

Japanese says “Kan toku sha”.

The last letter means to remove the “者”. If you remove that character, in Japan it means a director who makes TV programs, movies, animations, etc.
Japanese says “Kan toku”.