The term "yapper" is generally used to describe a person who talks incessantly or annoyingly. There are several synonyms that can be used in place of this particular word. For instance, the word "babbler" can be used to describe someone who talks too much and often without thinking. Another word that can be used as a synonym for "yapper" is "chatterbox". This word is particularly useful when describing someone who talks non-stop about trivial or unimportant matters. Another word that can be used instead of "yapper" is "gabber". This is particularly useful when describing someone who talks too much about themselves or their personal experiences.