debater

noun

1. One who debates or participates in a debate; one who argues.

   “William is a great debater.”

   “Benjamin Disraeli, who was a pretty bright guy—a novelist, debater, and prime minister of England—tried to identify a person once and ended up exclaiming, "A Polish nobleman, a Count somebody; I never can remember their crack-jaw name."”

   “Chief among the strategies exploiting this rule was "spreading" (a combination of "speed" and "reading"), where debaters would rattle off arguments at a blistering pace. Their speeches often exceeded 300 words per minute. (A conversational pace is about 60 per minute.)”