Chocolate
From SUALEX
The word chocolate ("cacao-based drink" first attested ) comes from Nahuatl <chocolatl>, which in turn comes, by way of anticipatory vowel assimilation of i to o, from earlier /tʃikola:tl/ a form still attested in some Nahuatl varieties. In spite of the fact that Wixárika has the word tsíkurati "chocolate", this word cannot be reconstructed for PCN, as the Wixárika word is most likely a Nahuan loan.
There is a persistent claim that the Nahuatl source of chocolate is a word xocolatl or xocoatl - this is false. Xocolatl is not attested in any original source, and xocoatl is attested by Molina but refers to a sour maize-based drink.