Sound or noise?

Sound and noise are nouns. We can use them both as countable or uncountable nouns. Both refer to something which you can hear, but when a sound is unwanted or unpleasant, we call it a noise:

• There were lots of sounds in the forest. (countable)
• It travels faster than the speed of sound. (uncountable)
• She made a lot of noise. (uncountable)
• There were some funny noises coming from the engine. (countable)