noise - sound, hear - awareness of sound, ear - organ that hears sound, noisy - lots of sound, loud - high volume of sound, quiet - low volume of sound, vibration - he rapid back-and-forth movement of physical particles which create sound as a reaction to different forces, volume - how loud or quiet a sound is, sound wave - how sound travels; vibrations through particles, pitch - how high or low a sound is, frequency - a measure of the number of waves that pass a fixed point per second, tone - sound of a musical note, speak - to talk, amplify - to make louder, muffle - to make quieter, hertz - unit to measure sound frequency, decibel - unit to measure the loudness of sound,

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