See this question for example. I cannot imagine an example where "noise" is discussed but it is not about noise reduction. (noise enhancement???)
I suggest we keep the shorter one, noise, and make the other synonym.
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Clicking on the noise tag you can get some examples of questions about noise but no reduction:
Why is a Lockheed MC-130J Commando II creating such a loud droning sound?
What causes the nose landing gear knocking noise on a Boeing 777 while taxiing?
Can ADS-B used for voice communications?
So to me it is not clearly a synonym of noise-reduction given the current state of things.
