interjector

/ˌɪntərˈdʒɛktər/
noun
  1. A person who interjects, especially one who frequently interrupts others.
    • He was known as an interjector in class, always adding comments during lectures.
    • The interjector's remarks were often witty but disrupted the flow of the conversation.
    • The talk show host had to manage a persistent interjector in the audience.
Antonyms
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