Noise is a loud or unpleasant sound.

A noise is a sound that someone or something makes.

If someone makes noises of a particular kind about something, they say things that indicate their attitude to it in a rather indirect or vague way.

If you say that someone makes the right noises or makes all the right noises, you think that they are showing concern or enthusiasm about something because they feel they ought to rather than because they really want to.