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"speed" is also used as a crossword clue. If that's what you saw, the answer is often quickness (9 letters).
Definitions
changing location rapidly
Word origin
From Middle English sped (“prosperity, good luck, quickness, success”), from Old English spēd (“success”), from Proto-West Germanic *spōdi (“prosperity, success”), from Proto-West Germanic *spōan, from Proto-Germanic *spōaną (“to prosper, succeed, be happy”), from Proto-Indo-European *speh₁- (“to prosper, turn out well”).
Used in a sentence
“How does Usain Bolt run at that speed?”
“Returne with ſpeed, time paſſeth ſwift away, Our life is fraile, and we may dye to day.”
“Speed limits provide information to the drivers about the safe speed to travel in average conditions.”
Source: Wiktionary, CC BY-SA 4.0
Used as a crossword answer2 curated clues
01“Rate of motion”5 letters
02“Fast rate of movement”5 letters
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