I use the term [Quick] Styles Sets because it helps clarify that the only styles in a Style Set as that term is used by Microsoft are Qucik Styles. I did not coin the term but I certainly plan on using it. Likewise, I use the term [Quick] Styles Gallery to distinguish it from the Styles Pane and the Styles DropDown, both of which can show all the styles available.

Did you try either of the experiments?