hypersonic speed

16 LETTERS · STARTS WITH H

hypersonic speed is a valid 16-letter word worth 28 points in Scrabble and 30 points in Words with Friends.

SCRABBLE WORDS WITH FRIENDS

H4Y4P3E1R1S1O1N1I1C3S1P3E1E1D2

4 + 4 + 3 + 1 + 1 + 1 + 1 + 1 + 1 + 3 + 0 + 1 + 3 + 1 + 1 + 2 =28 PTS

DOUBLE WORD → 56TRIPLE WORD → 84

MEANING

What does hypersonic speed mean?