The term 'black lustrous' can be broken down into four crossword solutions: JET (3 letters), EBON (4 letters), RAVEN (5 letters), and SATEEN (6 letters). JET is a type of black, glossy mineral that is often used to make jewelry and other decorative items. EBON is an archaic word for black, usually referring to a deep, dark shade of the color. RAVEN is a large black bird that is known for its glossy feathers and intelligence. Finally, SATEEN is a type of fabric with a glossy finish that is often used to make clothing.