Gabber is a slang word that refers to someone who talks a lot or excessively. Some synonyms for gabber are chatterbox, blabbermouth, motor mouth, and yakker. These terms are often used to describe someone who is overly talkative and tends to dominate conversations. Other synonyms for gabber include prattler, babbler, gasbag, and windbag. These words all suggest a person who talks a lot but may not have much substance to what they say. The term gabber can be used affectionately or pejoratively depending on the context of the conversation. However, it is important to remember that everyone has a different communication style, and what one person considers excessive talking may not be the same for another.