The term 'smooth and lustrous' can be described by four different words: SILKY (5 letters), SLEEK (5 letters), SILKEN (6 letters) and SATINY (6 letters). SILKY is an adjective that describes something as having a smooth, soft texture, like silk. SLEEK is an adjective that describes something as having a smooth, glossy surface. SILKEN is an adjective that describes something as having a soft, smooth texture, similar to silk. SATINY is an adjective that describes something as having a smooth, glossy surface, like satin.