Departments in universities generally refer to colleges, such as management schools and law schools, and refer to majors in colleges, such as Chinese departments and philosophy departments. Extended information because the number of students in each school is different, the majors are under schools and colleges with few people, and the departments are under schools and colleges with many people. So different schools have different points, and there is no certain law.
For example, Tsinghua University is a large-scale civil engineering department, which can be upgraded to a college of civil engineering, but they have always been called the civil engineering department. The same is true internationally. Massachusetts Institute of Technology (MIT) is a world-famous institution. It is not called MIT.