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speed has 28 distinct synonyms spread across 9 of its 10 senses. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. WordNet records no antonym for it — antonymy is a relation between word forms rather than concepts, so it is deliberately sparse.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
distance travelled per unit time
a rate (usually rapid) at which something happens
“the project advanced with gratifying speed”
changing location rapidly
the ratio of the focal length to the diameter of a (camera) lens system
a central nervous system stimulant that increases energy and decreases appetite; used to treat narcolepsy and some forms of depression
move hurridly
“He rushed down the hall to receive his guests”
travel at an excessive or illegal velocity
“I got a ticket for speeding”
Synonyms, antonyms and the broader and narrower relations for speed come from Princeton University’s WordNet. Full sources and licences.