The word "knoller" is a relatively obscure term used to describe a person who repeatedly interrupts or talks over others. However, there are a number of synonyms which can also convey this meaning in different ways. These include words such as "interjector", "dominator", "over-talker", "monopolizer", "interruper", "assertor", "blabbermouth", "chatterbox" and "yapper". Each of these synonyms has slightly different connotations and can be used to describe someone who interrupts a conversation in a different way. Whether you are writing a paper or simply trying to use more descriptive language, there are many ways to describe someone who doesn't give others a chance to speak.