answerer

noun

1. A person who, or thing that, answers or responds.

   “1714, Jonathan Swift, The Publick Spirit of the Whigs, London: John Morphew, in Bertrand A. Goldgar and Ian Gadd (eds.), English Political Writings 1711-1714, The Cambridge Edition of the Works of Jonathan Swift, Cambridge University Press, 2008, p. 256, It is a very unfair Thing in any Writer to employ his Ignorance and Malice together, because it gives his Answerer double Work […]”

   “1892, Walt Whitman, “Song of the Answerer” in Leaves of Grass (abridged reprint of the 1892 edition), New York: Modern Library, 1921, p. 141, Now list to my morning’s romanza, I tell the signs of the Answerer, To the cities and farms I sing as they spread in the sunshine before me.”

   “He prayed that Leo didn't think he was a fool. The other men in Leo’s life, anonymous partners, answerers of ads, old boyfriends, old Pete, massed impatiently behind him […]”