Originally Posted by Jeff Neese

With all due respect to your credentials as an English teacher, I'm not sure that's technically correct.

You can have a group of chess pieces, that are not a set. You can have a group of bicycle parts that are not a groupset. Conversely, I think we can have a set of something that is not a group. A single set of salt and pepper shakers come to mind. But if you collect salt and pepper shakers, you would have a group of salt and pepper sets.

The words set and group have slightly different meanings, even if the difference is somewhat nuanced.