discharge vs purge

discharge

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

  • 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 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 expel or let go. 

  • 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. 

purge

verb
  • To free from sin, guilt, or the burden or responsibility of misdeeds. 

  • To void or evacuate (the bowels or the stomach); to defecate or vomit. 

  • To forcibly remove people from. 

  • To have or produce frequent evacuations from the intestines, as by means of a cathartic. 

  • To trim, dress, or prune. 

  • To remove by cleansing; to wash away. 

  • To clarify; to clear the dregs from (liquor). 

  • To cause someone to purge, operate on (somebody) as or with a cathartic or emetic, or in a similar manner. 

  • To clean thoroughly; to cleanse; to rid of impurities. 

  • To forcibly remove, e.g., from political activity. 

  • To become pure, as by clarification. 

  • To clear of a charge, suspicion, or imputation. 

noun
  • An evacuation of the bowels or a vomiting. 

  • That which purges; especially, a medicine that evacuates the intestines; a cathartic. 

  • A cleansing of pipes. 

  • An act of purging. 

  • A forcible removal of people, for example, from political activity. 

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