The enrollment of a course refers to the amount of students who enroll or register the course.
Faculty means the body of teachers and administrators at a school.
Faculty also refers to a kind of cognitive ability.
Body does not necessarily mean the main portion of living things. It could also refer to the main part of non-living things. For example, a water body can be a river or a lake. The body of an article means the main part of a paragraph.
Administrators are people who govern an organization.
You should also know administrate as its verb form and administrative as its adjective form and administration as another noun form .
5.staff 员工 & stuff 东西
Staff is different from stuff. Staff usually refers to a group of people while stuff can only be a pile of things.