The term 'Bing, Bang or Boom' is a phrase used to describe the sound of an explosion. The crossword solutions for this term are 'NOISE' and 'SONIC', both with 5 letters. NOISE is defined as a loud, unpleasant sound that can be heard over a wide area. SONIC is defined as relating to sound waves or vibrations in the air. Therefore, the crossword solutions for 'Bing, Bang or Boom' are 'NOISE' and 'SONIC', which accurately describe the sound of an explosion.