There are several synonyms for "housebuyer" that could be used in different contexts. One possibility is "homebuyer," which is the most common synonym and refers to someone who is purchasing a residential property. Another option is "property buyer," which is a more general term that can refer to someone who is buying any type of real estate, including commercial properties or land. "Real estate buyer" is another synonym that covers a broader range of properties and includes all types of real estate. Ultimately, the synonym chosen will depend on the context in which it is being used and the specific type of property being purchased.