There are many different synonyms for the term "fast-talker." Some commonly used options include the terms " smooth-talker," "silver-tongued," "glib," and "slick." All of these terms suggest someone who is particularly skilled at speaking quickly and persuasively, often in a way that is designed to win over others or convince them of a particular argument or viewpoint. Other terms that might be used as synonyms for "fast-talker" include "rapid-talker," "quick-tongued," or "fluent." Ultimately, the specific term that is used will depend on the context in which it is being used and the particular connotations that the speaker wants to convey.