William Hoover is a proper noun and a name for a person, therefore, there are no synonyms for it. However, the name William and Hoover can independently be substituted with alternative words or phrases that hold similar meanings. For example, the name William can be replaced with other male names such as James, John, or Michael. Similarly, the word Hoover can be substituted for vacuum cleaner, dust-buster or suction device. The usage of synonyms helps to avoid redundancy and make the text more interesting and varied for readers. However, proper names cannot be replaced as they are unique identifiers of individuals.