Crossword clues for the word: SPEEDOFSOUND The word SPEEDOFSOUND has appeared as an answer to at least 3 crossword clues on different crossword puzzles. Crossword clues for SPEEDOFSOUND Showing 1 to 3 of 3 results Clue(s) 2005 Coldplay hit whose title is sung after "And birds go flying at the ..." Exceeding it causes a boom Mach 1