Motor-mouth is a term used to describe someone who talks incessantly, often without pause or hesitation. However, there are several other synonyms that can be used to describe this type of person. One popular alternative is "chatterbox," which suggests someone who talks excessively and often about trivial matters. Other synonyms include "gabber," "blabbermouth," "jabberwocky," and "talkative." Each of these words suggests someone who enjoys talking and has a tendency to dominate conversations. While these words may have slightly different connotations, they all describe someone who is a bit of a chatterbox and enjoys talking a lot.