"No, step-ladders are ladders that are part of another ladder's family but aren't related by blood!"
"I... what?" Twilight sputtered, "Pinkie... no. That's... that's completely wrong. A ladder and a stepladder are practically identical to one another. The only difference is that the modern use of the term 'ladder' is best associated with a platform ladder, where there is a flat, non-step surface that--"
Pinkie waved at a tiny ladder scurrying away across the floor. "Now go be with the rest of your ladder family! See? Your step-ladder mom isn't an evil villain that wants to ruin your life, Cinderelladder!"