Badlands and Sand dune

Badlands noun - Deeply eroded barren land.

Sand dune and badlands are semantically related. In some cases you can use "Sand dune" instead a noun "Badlands".

Sand dune noun - A ridge of sand created by the wind; found in deserts or near lakes and oceans.

Badlands and sand dune are semantically related. Sometimes you can use "Badlands" instead a noun phrase "Sand dune".