noun
a person who speaks or behaves in an extravagant and impassioned way, typically in order to attract attention or impress others
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The speaker was a passionate ranter, delivering his speech with fervor and conviction.
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That ranter at the town hall meeting just wouldn't stop shouting about his opinions.
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I can't stand that ranter who is always going on about conspiracy theories.
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Her mind was like a chaotic ranter, with thoughts and ideas swirling around uncontrollably.