Castanets are percussion instruments that are commonly made out of wood or plastic. While castanets are typically associated with flamenco dancing and Spanish music, they can be used in a variety of musical genres. If you're looking for a synonym for castanet, there are a few options to choose from. Some people refer to castanets as clackers, clickers, or even just hand percussion. Other words that might describe a castanet sound include rattles, taps, or snaps. Whatever word you use to describe this versatile instrument, castanets can add an exciting, lively quality to any musical performance.