acknowledgment vs comeback

acknowledgment

noun
  • A reward or other expression or token of gratitude. 

  • The act of a person admitting a child as their own. 

  • A response (ACK) sent by a receiver to indicate successful receipt of a transmission (See Wikipedia article on transmission). 

  • A recognition as genuine or valid; an avowing or admission in legal form. 

  • The act of recognizing in a particular character or relationship; recognition of existence, authority, truth, or genuineness. 

  • A formal statement or document recognizing the fulfillment or execution of a legal requirement or procedure. 

  • An expression of gratitude for a benefit or an obligation. 

  • A message from the addressee informing the originator that the originator's communication has been received and understood. 

  • The act of acknowledging 

comeback

noun
  • A retort or answer, particularly a quick or clever one. 

  • A return (e.g. to popularity, success, etc.) after an extended period of obscurity. 

  • An occurrence of an athlete or sports team in a competition overcoming a substantial disadvantage in points to win or draw. 

How often have the words acknowledgment and comeback occurred in a corpus of books? (source: Google Ngram Viewer )