courser vs fink

courser

noun
  • Any of several species of bird in the genera Cursorius or Rhinoptilus of the family Glareolidae. 

  • A person who practises coursing. 

  • A dog used for coursing. 

  • A stone used in building a course. 

  • A racehorse or a charger. 

  • A hunter. 

fink

noun
  • Any of several birds in the family Ploceidae native to southern Africa. 

  • An informer. 

  • A strikebreaker. 

  • A contemptible person. 

verb
  • To betray a trust; to inform on. 

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