footprint vs spoor

footprint

noun
  • The impression of the foot in a soft substance such as sand or snow. 

  • A polygon representing the shape of an item. 

  • Availability of a satellite from the ground. 

  • Profession or lifestyle. 

  • The surface space occupied by a structure. 

  • The audit trail left by a crashed program. 

  • Space required by a piece of equipment. 

  • The ecological impact of a human activity, machine, etc. 

  • The amount of hard drive space required for a program. 

  • A company's geographic market presence. 

spoor

noun
  • The track, trail, droppings or scent of an animal. 

verb
  • To track an animal by following its spoor 

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