rac·quet·ball 
/ˈrækətˌbɑ:l/ noun
plural rac·quet·balls /ˈrækətˌbɑ:l/ noun 1 [noncount] : a game played on a court with four walls by two or four players who use rackets to hit a soft ball against the walls
▪ They were playing (a game of) racquetball. 2 [count] : the ball that is used in racquetball
▪ They were playing (a game of) racquetball.
