Question

Department is related to organization as employee is related to:

Answer 1

I would say staff. Departments are part of the body of organization, as employees make up the staff

Answer 2

DEPARTMENT is the name given to the different sections in which the organization is divided, for example, an administrative department. A company may have as many departments as it needed because it depends on the magnitude of it. Instead, when referring to employees the expression used is "STAFF" which by definition is the group of people who work for an organization.