Widely is commonly used to indicate the scope or extent of something. However, there are several synonyms for this word that can add a touch of variety to your writing. Some of these include extensively, broadly, vastly, commonly, largely, thoroughly, frequently, widely spread, and popularly. In certain contexts, the word "ubiquitously" can also be used to denote the extent of something. To replace the term "widely known," you can choose other synonyms such as well-known, familiar, or famous. Using different synonyms for "widely" can help prevent repetitive language in your writing and ensure that your work is more engaging and captivating.