仕し事ごと関かん係けい者しゃ

Meanings

1

business associate; work-related contact

Refers to a person one knows through work, such as a colleague, client, or business partner. Neutral term.

someone, person

同どう僚りょう
同僚 specifically means a colleague at the same workplace, while 仕事関係者 is broader and can include clients, partners, or anyone connected through work.
取とり引ひき先さき
取引先 refers to a business partner or client with whom one has transactions, whereas 仕事関係者 is a more general term for any work-related person.

Compound of 仕事 (work) + 関係者 (related person).