milepost vs vestige

milepost

noun
  • A post on a highway, often with one or more fingerposts, showing the distance in miles to nearby places 

  • A sign or post beside a railway marking the distance from the (actual or nominal) start of a line (usually the principal terminus or junction with a more major line) 

verb
  • To place mileposts along (a road, etc.). 

vestige

noun
  • A mark left on the earth by a foot. 

  • A faint mark or visible sign left by something which is lost, or has perished, or is no longer present. 

  • A vestigial organ; a non-functional organ or body part that was once functional in an evolutionary ancestor. 

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