suffix
assistant ...; probationary ...
Suffix attached to job titles or roles to indicate an assistant, deputy, or probationary status. Common in organizational contexts.
彼は補佐官補として働いている。
He works as an assistant aide.
彼女は裁判官補に任命された。
She was appointed as an assistant judge.
補佐 is a noun meaning 'assistance' or 'aide', while 補 is a suffix that attaches to titles to indicate an assistant or probationary role.
The kanji 補 means 'supplement' or 'assist'. As a suffix, it derives from this meaning, indicating a supporting or probationary role.