| airspeed | (noun) the speed of an aircraft relative to the air in which it is flying | - |
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| groundspeed | (noun) the speed of an aircraft relative to the ground | - |
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| speed | (noun) changing location rapidly | Synonyms: hurrying, speeding |
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| (noun) a central nervous system stimulant that increases energy and decreases appetite; used to treat narcolepsy and some forms of depression | Synonyms: amphetamine, pep pill, upper |
| (noun) a rate (usually rapid) at which something happens | Synonyms: fastness, swiftness |
| (noun) the ratio of the focal length to the diameter of a (camera) lens system | Synonyms: f number, focal ratio, stop number |
| (noun) distance travelled per unit time | Synonyms: velocity |
| speedboat | (noun) a fast motorboat | - |
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| speeder | (noun) a driver who exceeds the safe speed limit | Synonyms: speed demon |
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| speediness | (noun) a rate that is rapid | Synonyms: celerity, quickness, rapidity, rapidness |
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| speeding | (noun) changing location rapidly | Synonyms: hurrying, speed |
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| speedometer | (noun) a meter fixed to a vehicle that measures and displays its speed | Synonyms: speed indicator |
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| speedpaint | (noun) Painting a picture in a very short amount of time | - |
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| speedskater | (noun) an ice-skater who races competitively; usually around an oval course | Synonyms: speed skater |
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| speedup | (noun) the act of accelerating; increasing the speed | Synonyms: acceleration, quickening |
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| speedway | (noun) a racetrack for racing automobiles or motorcycles | - |
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| (noun) road where high speed driving is allowed | - |
| speedwell | (noun) any plant of the genus Veronica | Synonyms: veronica |
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