The word "shrills" refers to a high-pitched sound that is often piercing or disturbing to the ears. Some synonyms for the word shrills are screeches, squeals, yelps, shrieks, squawks, and cackles. These words are often used to describe sounds made by animals, such as birds, cats, and dogs, or by humans during moments of extreme emotion or pain. Each of these synonyms for shrills has a slightly different connotation, with some implying a sense of urgency or danger, while others may be more playful or humorous. Regardless, they all evoke a sense of loud, sharp, and jarring sound.