CORE WORDS
COMPOUND WORDS
hypersonic | {adj} | (five times the speed of sound) | sonic | {adj} | (of or relating to sound) | sonic boom | {n} | (the audible effect of a shock wave in the air) | supersonic | {adj} | (greater than the speed of sound) | ultrasonic | {adj} | (beyond (higher in frequency than) the range of sound perceptible to the human ear)
5000 WORDS
PHRASES
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