Co-op and Sand dune

Co-op noun - A jointly owned commercial enterprise (usually organized by farmers or consumers) that produces and distributes goods and services and is run for the benefit of its owners.

Sand dune and co-op are semantically related. In some cases you can use "Sand dune" instead a noun phrase "Co-op".

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

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