Is KOJI a valid Scrabble word?

Yes. KOJI is valid in Collins Scrabble Words 2024, the word list used for Scrabble in the UK.

What KOJI means

• noun - A substance that is produced by letting a mold, especially Aspergillus oryzae, grow on rice, barley, soybeans, etc., used to make fermented...

Definitions come from Wiktionary via kaikki.org, shortened to fit, and are used under CC BY-SA 4.0.

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