The crossword solution for the term PROTRUDENCE is LUMP, which is a four-letter word. Protrusion is defined as a part of something that sticks out or projects from a surface. It can refer to a physical feature, such as a bump or LUMP on the skin, or a protruding object, such as a nail sticking out of a wall. In this case, the term protrucence is being used to describe a LUMP or bump that is visible on the surface.