jamb vs king post

jamb

noun
  • 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. 

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

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

verb
  • To fix or attach a jamb to. 

king post

noun
  • A central vertical supporting post used in architecture and bridge as well as in aircraft and ship design. 

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