| 100% | SUBSONIC | 8 | Speed beneath the sound barrier |
| 53% | YEAGER | 6 | Chuck who broke the sound barrier |
| 52% | SONICBOOM | 9 | Noise heard when breaking the sound barrier |
| 51% | SST | 3 | It's not breaking the sound barrier anymore |
| 51% | CONCORDE | 8 | Supersonic plane, broke the sound barrier in 1969 |
| 51% | SONICBOOM | 9 | Explosion heard when the sound barrier is broken |
| 51% | YEAGER | 6 | Chuck, first pilot to break the sound barrier |
| 50% | CHUCK | 5 | US pilot Yeager, first to break the sound barrier |
| 50% | WHIP | 4 | First object made by humans to break the sound barrier |
| 49% | MACHONE | 7 | The speed of sound |
| 49% | MACHI | 5 | The speed of sound |
| 46% | SUBSONIC | 8 | Below the speed of sound |
| 46% | MACH2 | 5 | Double the speed of sound |
| 45% | SUPERSONIC | 10 | Faster than the speed of sound |
| 45% | THRUST | 6 | — SSC, car driven by Andy Green that broke the sound barrier on land in 1997 |
| 45% | BOOM | 4 | Sound made when passing the sound barrier |
| 45% | BOOM | 4 | Sound made when breaking the sound barrier |
| 44% | SUPERSONIC | 10 | In excess of the speed of sound |
| 44% | TRANSONIC | 9 | Moving close to the speed of sound |
| 43% | SONIC | 5 | "Service at the Speed of Sound" fast-food franchise |
| 43% | SONIC | 5 | "Service at the Speed of Sound" fast-food chain |
| 43% | MACH | 4 | It's calculated relative to the speed of sound |
| 42% | CHUCKYEAGER | 11 | First pilot to travel faster than the speed of sound |
| 42% | SONICBOOM | 9 | Noise from a plane flying above the speed of sound |
| 42% | MACH | 4 | ___ number (measure of velocity relative to the speed of sound) |
| 42% | SONICBOOM | 9 | Sound of an aircraft breaking the sound barrier |
| 41% | MACH | 4 | Physicist Ernst whose name is associated with the speed of sound |
| 40% | EXOCET | 6 | Anti-ship missile that skims waves at nearly the speed of sound |
| 39% | SONICBOOM | 9 | What you hear when a plane breaks the speed of sound: 2 wds. |
| 39% | REEF | 4 | Sound barrier? |