We found one dictionary that defines the word waternut:

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1. waternut: Wiktionary

Definitions from Wiktionary (waternut) ▸ noun:  Synonym of jelly coconut ▸ Words similar to waternut ▸ Usage examples for waternut ▸ Idioms related to waternut ▸ Wikipedia articles (New!) ▸ Popular adjectives describing waternut ▸ Words that often appear near waternut ▸ Rhymes of waternut ▸ Invented words related to waternut