Whose is an interrogative pronoun that is used to ask about ownership or possession. Some synonyms for whose include which person's, to whom does, who has, or belonging to whom. These words all imply a sense of ownership or possession. In addition to these simple synonyms, there are also some more complex phrases that can be used, such as "to whom does this belong," or "who is the rightful owner." The use of synonyms for whose can also add variety and interest to one's writing, making it more engaging and effective.