A decorative knob is an ornamental piece of hardware that is used to add a decorative touch to a door, drawer, or cabinet. The two crossword solutions for the term 'decorative knob' are finial (6 letters) and BOSS (4 letters). A finial is a decorative element that is typically placed at the top of a post or spire, while a BOSS is a raised ornamentation that is often found in the center of a shield or other object. Both finials and bosses can be used as decorative knobs.