jamb vs lever

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. 

lever

verb
  • To use, operate or move (something) like a lever (physically). 

  • To move with a lever. 

  • To increase the share of debt in the capitalization of a business. 

  • To use (something) like a lever (in an abstract sense). 

noun
  • A bar, as a capstan bar, applied to a rotatory piece to turn it. 

  • An arm on a rock shaft, to give motion to the shaft or to obtain motion from it. 

  • A levee. 

  • A rigid piece which is capable of turning about one point, or axis (the fulcrum), and in which are two or more other points where forces are applied; — used for transmitting and modifying force and motion. 

  • A small such piece to trigger or control a mechanical device (like a button). 

  • Specifically, a bar of metal, wood or other rigid substance, used to exert a pressure, or sustain a weight, at one point of its length, by receiving a force or power at a second, and turning at a third on a fixed point called a fulcrum. It is usually named as the first of the six mechanical powers, and is of three kinds, according as either the fulcrum F, the weight W, or the power P, respectively, is situated between the other two, as in the figures. 

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