A protective coat is a type of covering that is used to protect an object from damage or wear. ARMOR, which is five letters long, is a type of protective coat that is made of metal or other strong materials and is designed to protect the wearer from physical harm. SEALER, which is six letters long, is a type of protective coat that is applied to a surface to protect it from moisture, dirt, and other contaminants. ENAMEL, which is also six letters long, is a type of protective coat that is made of a hard, glossy material and is used to protect surfaces from scratches and corrosion.