We found 2 dictionaries that define the word playground balls:

General (2 matching dictionaries)

1. playground balls: Merriam-Webster
2. playground balls: Vocabulary.com

(Note: See playground_ball as well.)

Definitions from Wiktionary (playground ball) ▸ noun:  The game of softball. ▸ Also see playground_ball ▸ Words similar to playground balls ▸ Usage examples for playground balls ▸ Idioms related to playground balls ▸ Wikipedia articles (New!) ▸ Words that often appear near playground balls ▸ Rhymes of playground balls ▸ Invented words related to playground balls