The fretboard of a guitar or any other stringed instrument is a well-known term among musicians. However, there are several other synonyms to describe this part of an instrument. The most common synonym for fretboard is the fingerboard, which is used not only for the guitar but also for other instruments like violins. Other terms that can be used as synonyms for fretboard include the "neck," "finger rest," and "playing surface." The fretboard, fingerboard, neck, or finger rest can be made of different materials like ebony, maple, and rosewood, and they are all essential parts of any instrument that relies on strings for its sound.