Scrabble Dictionary

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Yes, canner is playable

...and is worth 11 points.

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TWL06 (NASPA List 2006)

"Canner" Definition

noun

A large pot used for processing jars when preserving food, either in a boiling water bath or by capturing steam to elevate the pressure and temperature.
Source: Wiktionary
Someone or something which cans.
Source: Wiktionary
Someone who lives off container deposit refunds from recycling.
Source: Wiktionary