Check and doublecheck are two common expressions used to convey the importance of verifying something multiple times to ensure accuracy. However, there are many synonyms that can be used to convey the same idea. Some examples include: confirm and reconfirm, scrutinize and overanalyze, review and examine, validate and authenticate, cross-check and countercheck, inspect and probe, and audit and survey. Each of these words highlights the importance of double-checking and verifying information to avoid errors and mistakes. Using different synonyms can keep your writing interesting while still conveying the importance of being thorough and meticulous in your work.