業務（事業活動全般を名辞する場合）とオペレーション

business operation
Operations is considered distinct from other business activities, such as "financing" (raising money by issuing stocks and bonds) and "investing" (e.g. acquiring another company or selling off a subsidiary).
Operations means the core activities of a business; making money by selling goods & services.

つまり、operationsはbusiness activitiesの一部

business activities