All pancakes are flapjacks, but not all flapjacks are pancakes. I learnt that today. And I'm sure there's a debate among chefs and cooks in there somewhere.

Now I know the XP100 is code for experimental pistol 100, but I wouldn't necessarily call that contraption a pistol whether it technically is or not.
But a revolver,...a revolver is most definitely a pistol. Whether you call it a Colt, wheelgun, smokewagon, Blackhawk, K-frame, six shooter, it's still a pistol, pistola, heat, rod, ect.