component part,
component,
constituent,
portion,
part an artifact that is one of the individual parts of which a composite entity is made up; especially a part that can be separated from or attached to a system; "spare components for cars"; "a component or constituent element of a system"
detail -
extended treatment of particulars; "the essay contained too much detail"
discussion,
discourse,
treatment an extended communication (often interactive) dealing with some particular topic; "the book contains an excellent discussion of modal logic"; "his treatment of the race question is badly biased"
detail -
a crew of workers selected for a particular task; "a detail was sent to remove the fallen trees"