The term 'EATING SOUND' can be broken down into two crossword solutions: NOM (3 letters) and CHOMP (5 letters). NOM is an onomatopoeic word used to describe the sound of someone eating, usually with their mouth open. It is often used to describe a child's eating habits. CHOMP is another onomatopoeic word used to describe the sound of someone biting or chewing food. It is often used to describe the sound of someone eating something crunchy.