The term 'Bang or Boom' is a phrase used to describe loud noises, such as explosions. The crossword solutions for this term are NOISE (5 letters), SPAR (4 letters), SONIC (5 letters), and REPORT (6 letters). NOISE refers to any sound that is loud, unpleasant, or disruptive. SPAR is a type of combat training that involves physical contact between two opponents. SONIC is a term used to describe sound waves that travel faster than the speed of sound. REPORT is a written or spoken account of an event or situation.