aid vs stimulation

aid

noun
  • A helper; an assistant. 

  • Help; assistance; succor, relief. 

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

  • 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. 

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

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

stimulation

noun
  • A pushing or goading toward action. 

  • An activity causing excitement or pleasure; the act of stimulating. 

  • Any action or condition that creates a response; sensory input. 

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