loess

As nouns the difference between dune and loess

is that dune is a ridge or hill of sand piled up by the wind while loess is any sediment, dominated by silt, of eolian (wind-blown) origin.

As a proper noun Düne

is an island close to {{l/en|Heligoland}.

As nouns the difference between alluvium and loess

is that alluvium is soil, clay, silt or gravel deposited by flowing water, as it slows, in a river bed, delta, estuary or flood plain while loess is any sediment, dominated by silt, of eolian (wind-blown) origin.