The term "big noise" is a colloquial expression that refers to someone who is considered important or influential. However, this term has several synonyms that can be used in different contexts. For instance, one can call an important person a "bigwig," a "mover and shaker," a "heavyweight," or a "power player." Additionally, a person's influential status can also be described as being "high-profile," "influential," "prestigious," "prominent," or "noteworthy." Overall, using synonyms for "big noise" is useful in avoiding repetitive language and adding variety to one's writing. Each synonym has its own connotation and can help convey a slightly different meaning.