rebutter vs debater

rebutter and debater both are nouns.

Word	Noun	Adjective	Verb	Adverb
rebutter	Yes	No	No	No
debater	Yes	No	No	No

As nouns, debater is a hypernym of rebutter; that is, debater is a word with a broader meaning than rebutter:

rebutter: a debater who refutes or disproves by offering contrary evidence or argument
debater: someone who engages in debate

Other hypernyms of rebutter include arguer.

rebutter (noun)	debater (noun)
(law) a pleading by the defendant in reply to a plaintiff's surrejoinder	someone who engages in debate
a debater who refutes or disproves by offering contrary evidence or argument