The term "khen" refers to a musical instrument that is commonly used in Tibetan and Bhutanese culture. Although there aren't many synonyms for this particular word, there are a few alternative words that can be used interchangeably. Some of these synonyms include the terms "sheng", "hornpipe", and "pen-sipa". These words all refer to traditional instruments that produce a similar sound as the khen. While the khen is typically made of brass, bamboo, and reed, these alternative instruments can be composed of different materials such as wood, bone, and metal. Regardless of the instrument used, they all play an essential part in traditional music from these cultures.