Sand dune and Sand-hill

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

Sand-hill and sand dune are semantically related. In some cases you can use "Sand-hill" instead a noun phrase "Sand dune".

Sand dune and sand-hill are semantically related. Sometimes you can replace phrase "Sand dune" with "Sand-hill", this phrases are similar.