aid vs exhaust

aid

verb
  • To provide support to; to further the progress of; to help; to assist. 

  • To climb with the use of aids such as pitons. 

noun
  • Help; assistance; succor, relief. 

  • An historical subsidy granted to the crown by Parliament for an extraordinary purpose, such as a war effort. 

  • A helper; an assistant. 

  • An exchequer loan. 

  • Something which helps; a material source of help. 

  • A pecuniary tribute paid by a vassal to his feudal lord on special occasions. 

  • The rider's use of hands, legs, voice, etc. to control the horse. 

exhaust

verb
  • To discuss thoroughly or completely 

  • To empty by drawing or letting out the contents 

  • To bring out or develop completely 

  • To subject to the action of various solvents in order to remove all soluble substances or extractives 

  • To draw or let out wholly; to drain off completely (:liquid) 

  • to tire out; to wear out; to cause to be without any energy 

  • To use up; to deplete, drain or expend wholly, or until the supply comes to an end 

noun
  • An exhaust pipe, especially on a motor vehicle. 

  • A system consisting of the parts of an engine through which burned gases or steam are discharged; see also exhaust system. 

  • The steam let out of a cylinder after it has done its work there. 

  • The dirty air let out of a room through a register or pipe provided for the purpose. 

  • exhaust gas. 

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