Millcayac
Millcayac was a Huarpean language once spoken in Argentina.
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Millcayac (Milykayak) was one of the Huarpean languages. It was native to Cuyo in Argentina, but was displaced to Chile in the late 16th century. Luis de Valdivia wrote a grammar, vocabulary and religious texts. The people became Mestizo and lost their language soon after.
From Wikipedia · Millcayac language · CC BY-SA 4.0
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Vocabulary compares 40 basic words (ASJP); grammar compares 195 features (Grambank). Similar is not always related.