The crossword solution for the term 'Jet Sounds' is 'ROARS'. Jet engines produce a loud roaring sound due to the combustion of fuel and air in the engine. This sound is caused by the rapid expansion of exhaust gases as they are released from the engine. The sound is amplified by the shape of the engine exhaust nozzle, which directs the sound forward. The sound of a jet engine can be heard from miles away and is one of the most recognizable sounds in the world.