Shoulder-high is a descriptive term commonly used to describe the height or position of an object or surface in relation to a person's shoulders. However, there are several synonyms that can be used interchangeably to describe the same level or position. Some popular synonyms of shoulder-high include waist-high, chest-high, eye-level, and head-high. When describing an object or surface that is slightly above the shoulders, one can use synonyms like neck-high or chin-high. Additionally, terms like knee-high and hip-high can be used when describing lower heights. Ultimately, the synonym used depends on the context, but knowing a variety of options can make communication more precise and effective.