Cleft and Sinkhole

Cleft noun - An irregular usually narrow break in a surface created by pressure.

Sinkhole and cleft are semantically related. In some cases you can use "Sinkhole" instead a noun "Cleft".

Sinkhole noun - A depression in the ground communicating with a subterranean passage (especially in limestone) and formed by solution or by collapse of a cavern roof.

Cleft and sinkhole are semantically related. Sometimes you can use "Cleft" instead a noun "Sinkhole".