Answer
Rounded corner or just Round Corner. Adding the “corner”, to me, means there’s an apparent corner as opposed to the Pill shape.
As @Wolff points out in the comment above, both the pill shape and the shape preceding it are “rounded” shapes, merely the radius of the rounding varies. So.. I’d use a more specific name for what you’ve labeled as “rounded”.
I’d probably change the list.
Squared
–Rounded
–Pill
–Lined
–Dashed
orSquared
–Rounded
–Stadium
–Lined
–Dashed
orSquared
–Rounded
–Oblong
–Lined
–Dashed
Related: What is this shape that looks like a rectangle with rounded ends called?
Attribution
Source : Link , Question Author : Bruno Wego , Answer Author : Scott