The term 'Bullet Sound' can refer to a variety of different sounds, from the sound of a bullet being fired to the sound of a speeding train. The crossword solutions for this term include 'PING' (4 letters), 'Than' (4 letters), 'Acela' (5 letters), 'Seger' (5 letters), 'ZING' (4 letters), and 'Spang' (5 letters). 'PING' is a sharp, high-pitched sound, often associated with metal objects such as bullets or trains. 'Than' is a word used to compare two things, and could be used to describe the sound of a bullet or train. 'Acela' is the name of a high-speed train that runs between Washington, D.C. and Boston, and its sound could be described as a 'bullet sound'. 'Seger' is a reference to Bob Seger, an American singer-songwriter who wrote a song called 'Like a Rock' which includes the lyric 'I hear the sound of a highway, a bullet la-la-la'. 'ZING' is a sound often associated with speed, and could be used to describe the sound of a bullet or train. Finally, 'Spang' is a sound that is similar to a 'PING', but with more force, and could also be used to describe the sound of a bullet or train.