The crossword solution for the term FRONT-DOOR RUG is MAT, which is a three letter word. A MAT is a piece of fabric or other material used to cover a floor or other surface for decoration, protection, or comfort. It is often placed at the entrance of a home or building to provide a place for people to wipe their feet before entering. A front-door rug is a type of MAT that is specifically designed to be placed at the entrance of a home or building.