WordNet sense 1 (the auditory experience of sound that lacks musical quality; sound that is a disagreeable auditory experience):

dissonance, noise

WordNet sense 2 (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):

racquet

WordNet sense 3 (celebrate noisily, often indulging in drinking; engage in uproarious festivities):

revel, wassail, jollify, make happy, make merry, make whoopie, whoop it up

WordNet sense 4 (an illegal enterprise (such as extortion or fraud or drug peddling or prostitution) carried on for profit):

fraudulent scheme, illegitimate enterprise