Cosao
Cosao is a Sino-Tibetan language spoken in China and Laos. Glottolog rates it shifting.
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Cosao (autonym: tsʰo55 sɔ55; Chinese: 搓梭) is a Loloish language of China and Laos. The Cosao call themselves tsʰo55 sɔ55, but are referred to by other ethnic groups as the Paijiao people (排角人). They are officially classified by the Chinese government as ethnic Hani people.
From Wikipedia · Cosao language · CC BY-SA 4.0
Most similar languages
Vocabulary compares 40 basic words (ASJP); grammar compares 195 features (Grambank). Similar is not always related.