When describing a guitar, there are several synonyms that can be used for "guitar-shaped". These include: 1. Six-stringed: This term focuses on the number of strings on a typical guitar and is a subtle way of describing its shape. 2. Acoustic: This synonym highlights the type of guitar, as typically acoustic guitars have a distinct shape different from electric guitars. 3. Curved: This describes the curved shape of the guitar body, which is usually wider at the bottom and narrower at the top. 4. Stringed: Similar to "six-stringed", this synonym emphasizes the guitar's main feature - its strings - to describe its shape. 5. Pear-shaped: Some guitars have a pear-like body shape, with a narrow top and wide bottom. Using these alternative terms adds variety and interest to descriptions of guitars and can help to evoke a more specific image in the reader's mind.