jamb vs milepost

jamb

verb
  • To fix or attach a jamb to. 

noun
  • Synonym of jambeau (“piece of armor for the leg”). 

  • Either of the vertical components that form the side of an opening in a wall, such as that of a door frame, window frame, or fireplace. 

  • Any thick mass of rock that prevents miners from following the lode or vein. 

milepost

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

noun
  • 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) 

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

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