"All revolvers are pistols but not all pistols are revolvers,"
Exactly. Just as Winchester 94, Ruger Number 1, Remington 760 or a Mauser 98 are rifles.
This is correct, and Jeff Cooper agreed, based on the French-Spanish word origin.
I think we have the ATF to thank for the modern usage which separates "revolver" from "pistol".
But they also call a suppressor a "silencer".
