| sky | (noun) the atmosphere and outer space as viewed from the earth | - |
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| skybox | (noun) an elevated box for viewing events at a sports stadium | - |
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| skycap | (noun) a porter who helps passengers with their baggage at an airport | - |
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| skydiver | (noun) a person who jumps from a plane and performs various gymnastic maneuvers before pulling the parachute cord | - |
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| skydiving | (noun) performing acrobatics in free fall before pulling the ripcord of a parachute | - |
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| skyhook | (noun) a hook that is imagined to be suspended from the sky | - |
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| (noun) helicopter carrying a reel of steel cable that can be used to lift and transport heavy objects | - |
| skylark | (noun) brown-speckled European lark noted for singing while hovering at a great height | Synonyms: Alauda arvensis |
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| skylight | (noun) a window in a roof to admit daylight | Synonyms: fanlight |
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| skyline | (noun) the line at which the sky and Earth appear to meet | Synonyms: apparent horizon, horizon, sensible horizon, visible horizon |
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| (noun) the outline of objects seen against the sky | - |
| skyrocket | (noun) sends a firework display high into the sky | Synonyms: rocket |
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| (noun) propels bright light high in the sky, or used to propel a lifesaving line or harpoon | Synonyms: rocket |
| skysail | (noun) the sail above the royal on a square-rigger | - |
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| skyscraper | (noun) a very tall building with many stories | - |
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| skywalk | (noun) an elevated walkway between buildings (usually enclosed) | - |
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| skyway | (noun) a designated route followed by airplanes in flying from one airport to another | Synonyms: air lane, airway, flight path |
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| skywriting | (noun) writing formed in the sky by smoke released from an airplane | - |
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