We found one dictionary that defines the word nerf balls:

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1. nerf balls: Wiktionary

▸ Words similar to nerf balls ▸ Usage examples for nerf balls ▸ Idioms related to nerf balls ▸ Wikipedia articles (New!) ▸ Words that often appear near nerf balls ▸ Rhymes of nerf balls ▸ Invented words related to nerf balls