Pillow material can refer to a variety of fabrics and materials used to make pillows. DOWN, with four letters, is a type of soft, fluffy feathers from ducks or geese that is often used as a filling for pillows. SATIN, with five letters, is a smooth, glossy fabric made from silk, nylon, or polyester that is also used in pillow making. EIDER, with five letters, is a type of DOWN from the EIDER duck that is considered to be of higher quality than other types of DOWN. Foamrubber, with ten letters, is a type of synthetic rubber foam that is often used as a pillow filling.