fend off vs shipwreck

fend off

verb
  • To prevent (a vessel) from running against anything with too much violence. 

  • To defend against; to repel with force or effort 

shipwreck

verb
  • To wreck a boat through a collision or mishap. 

noun
  • An event where a ship sinks or runs aground. 

  • A ship that has sunk or run aground so that it is no longer seaworthy. 

  • destruction; ruin; irretrievable loss 

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