Hmmmmmn.
Pothole seems a poor term: more related to holes in a formed surface like a road.
So, since a sinkhole is formed differently than a "rockhole" (if the rockhole is formed by erosion of solid rock by falling water, and a sinkhole is made by loose water-soaked soil falling down), then what would they term the world's largest sinkhole?
Couldn't also be a pothole I would say.
The more standard sinkhole definition is a hole formed by surface collapse into a subsurface void caused by subsurface erosion. Most commonly referred to in karst terrain, where the erosion is chemical, but can also happen mechanically.