gnaw at vs wound

gnaw at

wound

noun
  • An injury, such as a cut, stab, or tear, to a (usually external) part of the body. 

  • A hurt to a person's feelings, reputation, prospects, etc. 

  • An injury to a person by which the skin is divided or its continuity broken. 

verb
  • To hurt (a person's feelings). 

  • To hurt or injure (someone) by cutting, piercing, or tearing the skin. 

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