The term 'Lustrous Black' can be broken down into four crossword solutions: JET (3 letters), EBON (4 letters), EBONY (5 letters), and RAVEN (5 letters). JET is a type of black, glossy, coal-like material that is often used in jewelry. EBON is an archaic term for black, derived from the Latin word for black. EBONY is a type of hardwood that is dark black in color and is often used to make furniture and musical instruments. Finally, RAVEN is a large black bird that is known for its glossy feathers.