"Noise" is unwanted or formless sound; "sound" is any acoustic signal, pleasant or not.
Unwanted, disturbing, or unstructured sound. Implies nuisance or disorder.
The construction noise outside made it impossible to work.
El ruido de la construccion afuera hizo imposible trabajar.
Could you keep the noise down? I am trying to sleep.
¿Puedes bajar el ruido? Estoy tratando de dormir.
There was a strange noise coming from under the car.
Habia un ruido extrano proveniente de abajo del auto.
Any vibration detectable by the ear. Neutral — can be music, voice, nature.
I love the sound of rain on the roof at night.
Me encanta el sonido de la lluvia en el techo de noche.
The sound of her voice calmed me down immediately.
El sonido de su voz me calmo de inmediato.
That plan sounds risky to me. Are you sure?
Ese plan me suena arriesgado. ¿Estas seguro?
Common mistake
Using "noise" for any sound when "noise" implies something unpleasant or unwanted. "The noise of the waterfall was beautiful" contradicts itself. Correct: "The sound of the waterfall was beautiful." Music is always "sound" (or "music"), never "noise" (unless you dislike it).
Trick to remember it
Ask yourself: does it bother me? If yes, "noise". If neutral or pleasant, "sound". Music someone else plays at 2am is "noise" to you. The same song you chose yourself is "sound" or just "music".
Quick rule
Noise = unwanted or disturbing sound. Sound = any sound, neutral in tone.
Did you know?
In science, "noise" has a precise technical meaning: it is random interference in a signal. "Signal-to-noise ratio" is a fundamental concept in physics, engineering, and even statistics. "White noise" is a random mix of all frequencies — paradoxically, many people use it to sleep because it masks other noises.
Exercise 1 · Pick the right one
The _____ of church bells on Sunday morning fills the whole neighborhood.
Exercise 2 · Pick the right one
I cannot concentrate with all this _____. Can someone turn the TV off?
Exercise 3 · Form the word
Noise = unwanted or disturbing sound. Sound = any sound, neutral in tone.
Using "noise" for any sound when "noise" implies something unpleasant or unwanted. "The noise of the waterfall was beautiful" contradicts itself. Correct: "The sound of the waterfall was beautiful." Music is always "sound" (or "music"), never "noise" (unless you dislike it).
Ask yourself: does it bother me? If yes, "noise". If neutral or pleasant, "sound". Music someone else plays at 2am is "noise" to you. The same song you chose yourself is "sound" or just "music".
Bryan López
Founder of SpeakUP Academy