The clue "Speed-of-sound word" last appeared in the USA Today crossword on September 8, 2025. The correct answer for this puzzle is "MACH", a 4-letter word.
Solution MACH is 4 letters long. So far we haven´t got a solution of the same word length.
There is 1 solutions. The longest is MACH with 4 letters, and the shortest is MACH with 4 letters.
No, "SPEED-OF-SOUND WORD" hasn´t seen a spike right now. Solvers are most interested in: Radiate, Really annoy, Wild party, Mixture and Change.
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The solution is 4 letters long.