evacuate vs unload

evacuate

verb
  • To remove; to eject; to void; to discharge, as the contents of a vessel, or of the bowels. 

  • To cause (or help) to leave or withdraw from. 

  • To make empty; to empty out; to remove the contents of, including to create a vacuum. 

  • To leave or withdraw from; to quit; to retire from 

  • To make empty; to deprive. 

  • To make void; to nullify; to vacate. 

unload

verb
  • To discharge, pour, or expel. 

  • To reduce the vertical load factor on (an airplane's wing or other lifting surface), typically by pitching downwards toward the ground to decrease angle of attack and reduce the amount of lift generated. 

  • To remove (the load or cargo) from a vehicle, etc. 

  • To deposit one's load or cargo. 

  • To give vent to or express; to unburden oneself of. 

  • To get rid of or dispose of. 

  • To remove the load or cargo from (a vehicle, etc.). 

  • To remove the charge from. 

  • To deliver forcefully. 

  • To ejaculate, particularly within an orifice. 

  • To remove (something previously loaded) from memory. 

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