There are several synonyms for the word "demerge" that convey similar meanings. Firstly, "deconsolidate" means to break apart or separate previously merged entities. Another synonym is "unbundle," which involves separating two or more bundled businesses or organizations. "Spin-off" is also a synonym for demerge, referring to the creation of a new company from a larger corporation's assets. Additionally, "unwind" or "undo" can be used to indicate the reversal of a previous merger. Finally, "segregate" can be used as a synonym for demerge when discussing the separation of specific components or parts of a company.