We found one dictionary that defines the word boys' room:

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1. boys' room: Wiktionary

Definitions from Wiktionary (boys' room) ▸ noun:  A restroom for boys. ▸ Words similar to boys' room ▸ Usage examples for boys' room ▸ Idioms related to boys' room ▸ Wikipedia articles (New!) ▸ Words that often appear near boys' room ▸ Rhymes of boys' room ▸ Invented words related to boys' room