overlay - noun

protective covering consisting, for example, of a layer of boards applied to the studs and joists of a building to strengthen it and serve as a foundation for a weatherproof exterior

a layer of decorative material (such as gold leaf or wood veneer) applied over a surface

overlay - verb

• put something on top of something else
• kill by lying on

overlay - thesaurus

cover   overlayer   overlie   sheathing