| drywall | (noun) a wide flat board used to cover walls or partitions; made from plaster or wood pulp or other materials and used primarily to form the interior walls of houses | Synonyms: dry wall, wallboard |
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| firewall | (noun) (colloquial) the application of maximum thrust | - |
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| (noun) a fireproof (or fire-resistant) wall designed to prevent the spread of fire through a building or a vehicle | - |
| (noun) (computing) a security system consisting of a combination of hardware and software that limits the exposure of a computer or computer network to attack from crackers; commonly used on local area networks that are connected to the internet | - |
| footwall | (noun) the lower wall of an inclined fault | - |
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| paywall | (noun) A mechanism used to limit access to only paying users | - |
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| seawall | (noun) a protective structure of stone or concrete; extends from shore into the water to prevent a beach from washing away | Synonyms: breakwater, bulwark, groin, groyne, jetty, mole |
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| sidewall | (noun) a wall that forms the side of a structure | - |
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| (noun) the side of an automobile tire | - |
| wall | (noun) an architectural partition with a height and length greater than its thickness; used to divide or enclose an area or to support another structure | - |
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| (noun) an embankment built around a space for defensive purposes | Synonyms: bulwark, rampart |
| (noun) a masonry fence (as around an estate or garden) | - |
| (noun) a layer of material that encloses space | - |
| (noun) (anatomy) a layer (a lining or membrane) that encloses a structure | Synonyms: paries |
| (noun) anything that suggests a wall in structure or function or effect | - |
| (noun) a vertical (or almost vertical) smooth rock face (as of a cave or mountain) | - |
| (noun) a difficult or awkward situation | - |