The phrase "be the right of" refers to the entitlement or permission to do something. Some synonyms for this phrase include: have the privilege of, possess the authority to, enjoy the benefit of, hold the power to, own the prerogative to, and be entitled to. Each of these phrases conveys a slightly different connotation while retaining the underlying meaning of having the right to do something. It is important to choose the appropriate synonym for the context in which it is being used as each phrase can alter the tone or emphasis of the sentence.