racket has 12 distinct synonyms spread across 4 of its 7 senses. Each sense below keeps its own list, because a synonym belongs to a meaning and not to a word: swapping one sense's substitute into another sense's sentence is how a thesaurus makes writing worse. WordNet records no antonym for it — antonymy is a relation between word forms rather than concepts, so it is deliberately sparse.
Counts are distinct word forms across every sense. A synonym that appears under three senses is counted once here and shown three times below, under each sense it belongs to.
an illegal enterprise (such as extortion or fraud or drug peddling or prostitution) carried on for profit
the auditory experience of sound that lacks musical quality; sound that is a disagreeable auditory experience
“modern music is just noise to me”
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
celebrate noisily, often indulging in drinking; engage in uproarious festivities
“The members of the wedding party made merry all night”
Synonyms, antonyms and the broader and narrower relations for racket come from Princeton University’s WordNet. Full sources and licences.