pedometer vs tattler

pedometer

noun
  • A device, often electronic, that measures the number of steps taken, and thus estimates the distance walked. 

tattler

noun
  • A device fitted to a vehicle to measure mileage etc. 

  • Either of two similar bird species in the shorebird genus Heteroscelus (Tringa in some taxonomies). 

  • One who tattles (notifies authorities of illicit behavior) or is inclined to do so; a tattletale. 

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