There are numerous synonyms for the phrase "awful noise," which can be used to accurately convey the sense of unpleasant, loud sound. Some examples of synonyms for the phrase include a cacophony, a dissonance, an ear-piercing din, a jarring clamor, a raucous racket, a shrill screech, or a thunderous roar. These synonyms can be used to give more specific and descriptive language to the nature and level of the unpleasant noise, helping to make the reader or listener better understand the impact of the sound on their senses. By choosing the right synonym, writers and speakers can create more effective and vivid descriptions in their communications.