Hypersonic speed
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In aerodynamics, hypersonic speed refers to speeds much faster than the speed of sound, usually more than approximately Mach 5.
CFD image of the NASA X-43A at Mach 7
Supersonic speed
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Supersonic speed is the speed of an object that exceeds the speed of sound. For objects traveling in dry air of a temperature of 20 °C at sea level, this speed is approximately 343.2 m/s. Speeds great
Hypersonic speed
…Transonic Supersonic speed NASA's Guide to Hypersonics…
A United States Navy F/A-18F Super Hornet in transonic flight
U.S. Navy F/A-18 approaching the speed of sound. The white cloud forms as a result of the supersonic expansion fans dropping the air temperature below the dew point.
British Airways Concorde in early BA livery at London-Heathrow Airport, in the early 1980s