rabble-rouser - definition and synonyms

noun [countable] 

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/ˈræb(ə)l ˌraʊzə(r)/
singularrabble-rouser
pluralrabble-rousers
  1. someone who speaks to a group of people and encourages them to behave in a violent way, usually in order to gain political power

derived word

rabble-rousing

noun [uncountable]