cheerleader

1. An enthusiastic and vocal supporter (synset 109933051)
   "he has become a cheerleader for therapeutic cloning"
   is a type of: admirer, booster, champion, friend, protagonist, supporter - a person who backs a politician or a team etc.
2. Someone who leads the cheers by spectators at a sporting event (synset 109932913)
   is a type of: leader - a person who rules or guides or inspires others

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