A strook chord, also known as a strummed chord, is a type of chord used in music where all the strings of a guitar or other stringed instrument are strummed at the same time. There are several synonyms for strook chord, including strummed chord, full chord, open chord, and block chord. Strummed chord refers to the action of strumming all the strings at once, while full chord, open chord, and block chord all describe the complex sound produced by all the strings being played together. These synonyms are often used interchangeably in music theory and practice, and are essential for guitarists and other musicians to know and understand to improve their playing skills.