Counterjumper is a rather uncommon word that many people may not be familiar with. It refers to someone who constantly jumps from one retail counter to another, without showing any intention of making a purchase. If you're looking for a synonym for this word, you could use terms like window-shopper, moocher, loiterer, or time-waster. Other possible options might include lurker, browser, or lingerer. All of these words imply someone who is taking up space in a store without buying anything, but they may differ slightly in terms of the connotations associated with them. Consider which word best suits the context in which you plan to use it.