discharge vs retire

discharge

verb
  • To expel or let go. 

  • To operate (any weapon that fires a projectile, such as a shotgun or sling). 

  • To send away (a creditor) satisfied by payment; to pay one's debt or obligation to. 

  • To relieve of an office or employment; to send away from service; to dismiss. 

  • To release (an accumulated charge). 

  • To release legally from confinement; to set at liberty. 

  • To let fly, as a missile; to shoot. 

  • To free of a debt, claim, obligation, responsibility, accusation, etc.; to absolve; to acquit; to forgive; to clear. 

  • To release (an auxiliary assumption) from the list of assumptions used in arguments, and return to the main argument. 

  • To unload a ship or another means of transport. 

  • To give forth; to emit or send out. 

  • To release (an inpatient) from hospital. 

  • To put forth, or remove, as a charge or burden; to take out, as that with which anything is loaded or filled. 

  • To set aside; to annul; to dismiss. 

  • To bleach out or to remove or efface, as by a chemical process. 

  • To release (a member of the armed forces) from service. 

  • To accomplish or complete, as an obligation. 

  • To let fly; to give expression to; to utter. 

noun
  • The volume of water transported by a river in a certain amount of time, usually in units of m³/s (cubic meters per second). 

  • The process of flowing out. 

  • The act of firing a projectile, especially from a firearm. 

  • Pus or exudate (other than blood) from a wound or orifice, usually due to infection or pathology. 

  • The act of accomplishing (an obligation) or repaying a debt etc.; performance. 

  • The act of expelling or letting go. 

  • The act of releasing an inpatient from hospital. 

  • The act of releasing an accumulated charge. 

  • The act of releasing a member of the armed forces from service. 

  • The process of unloading something. 

retire

verb
  • To withdraw; to take away. 

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

  • To cease use or production of something. 

  • 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 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 discharge and retire occurred in a corpus of books? (source: Google Ngram Viewer )