level vs retire

level

verb
  • To destroy by reducing to ground level; to raze. 

  • To direct or impose (a penalty, fine, etc) at or upon (someone). 

  • To make the score of a game equal. 

  • To bring to a common level or plane, in respect of rank, condition, character, privilege, etc. 

  • To adjust or adapt to a certain level. 

  • To speak honestly and openly with. 

  • To adjust so as to make as flat or perpendicular to the ground as possible. 

  • To progress to the next level. 

  • To aim or direct (a weapon, a stare, an accusation, etc). 

adj
  • In the same position or rank. 

  • Perpendicular to a gravitational force. 

  • Unvaried in volume. 

  • Of even tone; without rising or falling inflection; monotonic. 

  • Unvaried in frequency. 

  • Well balanced; even; just; steady; impartial. 

  • The same height at all places; parallel to a flat ground. 

  • Calm. 

  • At the same height as some reference; constructed as level with. 

  • Straightforward; direct; clear. 

noun
  • A floor of a multi-storey building. 

  • A school grade or year. 

  • Distance from the root node of a tree structure. 

  • Degree or amount. 

  • A numeric value that quantifies a character, ability, or item's experience and power. 

  • An area of almost perfectly flat land. 

  • One of the specific values which may be taken by a categorical variable. 

  • Achievement or qualification. 

  • A distance relative to a given reference elevation. 

  • A tool for finding whether a surface is level, or for creating a horizontal or vertical line of reference. 

  • One of several discrete segments of a game, generally increasing in difficulty and representing different locations in the game world. 

retire

verb
  • To cease use or production of something. 

  • To stop working on a permanent basis, usually because of old age or illness. 

  • To go back or return; to withdraw or retreat, especially from public view; to go into privacy. 

  • To fit (a vehicle) with new tires. 

  • To recede; to fall or bend back. 

  • To go to bed. 

  • To withdraw; to take away. 

  • To voluntarily stop batting before being dismissed so that the next batsman can bat. 

  • To retreat from action or danger; to withdraw for safety or pleasure. 

  • To withdraw from circulation, or from the market; to take up and pay. 

  • To cause to retire; specifically, to designate as no longer qualified for active service; to place on the retired list. 

  • To make a play which results in a runner or the batter being out, either by means of a put out, fly out or strikeout. 

noun
  • The act of retiring, or the state of being retired. 

  • A place to which one retires. 

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