Resonance is a term used to describe the phenomenon of sound waves being amplified and prolonged. REVERBERATION (13 letters) is an example of resonance, where sound waves are reflected off of surfaces and repeated multiple times, creating an echo-like effect. BOOM (4 letters) is another example of resonance, where a loud, low-pitched sound is created by a sudden release of energy. VIBRATION (9 letters) is also a form of resonance, where sound waves cause objects to vibrate and create sound. Finally, PLANGENCY (9 letters) is a type of resonance that produces a ringing or echoing sound.