The term 'PILLOW FILL' refers to the material used to fill a pillow. The two crossword solutions for this term are DOWN (4 letters) and KAPOK (5 letters). DOWN is a type of soft, fluffy feathers from ducks and geese that is often used as a pillow filling. KAPOK is a type of cotton-like fiber that comes from the seed pods of the KAPOK tree, which is native to tropical regions. It is also used as a pillow filling due to its light weight and buoyancy.