deathwatch vs woodworm

deathwatch

noun
  • A deathwatch beetle. 

  • One who guards a condemned person before execution. 

  • A vigil beside a dying person 

woodworm

noun
  • Any of many beetle larvae that bore into wood. 

  • Anobium punctatum, the Common Furniture Beetle. 

  • A shipworm, a worm-like mollusk in the family Teredinidae that feeds on wood underwater in saltwater. 

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