| A | B | 
| sound source | anything that vibrates to make sound | 
| vibration | a shaking, back and forth movement | 
| property | how something looks, feels, tastes and sounds | 
| sound receiver | anything that hears or responds to sound | 
| sound | something you hear, movement or wave | 
| sound discrimination | ability to identify objects and their sounds | 
| code | set of symbols representing letters used to communicate | 
| volume | how loud or soft a sound is | 
| pitch | how high or low a sound is | 
| longitudinal wave | a sound wave |