bailer vs cosigner

bailer

noun
  • One who bails or lades. 

  • A utensil, as a bucket or cup, used in bailing; a machine for bailing water out of a pit. 

cosigner

noun
  • A person who accepts joint responsibility for the debt of another 

  • A cosignatory 

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