There are several synonyms that can be used in place of the phrase "obtaining release of." These include securing, gaining, acquiring, earning, attaining, procuring, and retrieving. Each of these words refer to the action of obtaining something that has been withheld or restricted. For example, someone might "secure the release of a prisoner" or "procure the release of confidential information." Using synonyms not only adds variety to your writing but can also help to convey a different tone or emphasis. Choosing the right word can make a significant difference in the impact of your message, so it's essential to choose words that accurately represent your intentions.