The word "blabberer" is often used to describe someone who talks excessively, and often reveals secrets or personal information. If you are looking for some synonyms for this term, there are several options to consider. For example, you might use the term "gossip" to describe someone who talks too much about others. "Chatterbox" is another term that could be used to describe someone who just can't seem to stop talking. "Rambler" is a term that could be used to describe someone who goes on and on, without ever getting to the point. Other options might include "motor mouth," "jabberer," or "yakker".