Tuning pegs are an essential part of a stringed instrument that help in adjusting the tension of the strings to get the desired pitch. However, there are several synonyms for the term tuning peg that are used by different musicians and in various regions. One of the popular synonyms is a machine head, which refers to the mechanical part that holds the string and controls its pitch. Another synonym is a tuning key, which is a tool used to tighten or loosen the pegs. Other synonyms include tuning machines, tuning gears, and tuning locks. All these terms are used interchangeably and refer to the same essential part of a stringed instrument that enables musicians to create beautiful music.