It seems like there might be a bit of confusion here. The word "khuen" is not commonly found in English and does not have a widely recognized meaning. However, based on your suggestion, it seems to refer to a branch of the Tai languages, which are a group of languages spoken in Southeast Asia.
Part of Speech: Noun
"Khuen" is a noun that refers to a branch of the Tai languages, specifically spoken in northern Thailand. It is important in discussions about Southeast Asian languages and cultures.