CD-WO, or Compact Disc - Write Once, refers to a type of optical disc that enables users to record data on it only once. This technology has been largely replaced by more advanced CD-R and CD-RW discs. However, if you are looking for synonyms for CD-WO, you might consider using other terms such as "write-once compact discs," "single-use CDs," or "non-rewritable CDs." While these terms all refer to the same type of technology as CD-WO, they are often used more commonly in different contexts, and may be more appropriate depending on specific situations. Ultimately, the most important thing is to use language that is accurate and clear.