LICHEN-COVERED is a term used to describe an object or surface that is covered in lichen, which is a composite organism consisting of a fungus and an alga. MOSSY is a five letter word that can be used to describe something that is covered in moss, which is a type of small flowerless plant that typically grows in clumps or mats in damp or shady locations. Therefore, LICHEN-COVERED and MOSSY are both terms used to describe objects or surfaces that are covered in either lichen or moss.