Looking at the twelve questions tagged courses, I don't see the usage of this tag as necessary (the key points are already covered by other tags, and the tag courses seems redundant in those questions).
I think we can safely remove tag courses from those few questions, without the need of creating an (imperfect) synonym, and then let the system clean up the abandoned tag.
In most of my teaching the term coursework refers to what would be called "homework" at grade school. It is a specific assignment created by the teacher that when completed contributes to the assignment of grades based on the judged quality and content. The grade is usually the result of the course. There may be several items of coursework within a course. coursework differs from an examination in that it is done in the student's own time over a specified period.
However courses is completely different. This relates to a component of a degree programme (often worth a specific number of credits) that contains several elements of assessment, some of which may be coursework. The term courses can, in some places, be synonymous with a programme and elsewhere be a specific component of a programme (e.g degree programme).
There should be no synonym or blacklist action.
I also refer you to the meta question: Academia varies more than you think it does – The Movie
"Coursework" is also a bit more specific (that first question, "Why do TA teach sections?") isn't really about coursework.
I support the synonymization, but just some points to think about.