Pit and Sag

Pit noun - A sunken area forming a separate space.

Sag and pit are semantically related in convex topic. In some cases you can use "Sag" instead a noun "Pit".

Sag noun - The extent to which something hangs or dips below a straight line.

Pit and sag are semantically related in convex topic. Sometimes you can use "Pit" instead a noun "Sag".