2. an illegal enterprise (such as extortion or fraud or drug peddling or prostitution) carried on for profit
3. the auditory experience of sound that lacks musical quality; sound that is a disagreeable auditory experience;
"modern music is just noise to me"
4. a sports implement (usually consisting of a handle and an oval frame with a tightly interlaced network of strings) used to strike a ball (or shuttlecock) in various games