help vs oblige

help

verb
  • To provide assistance to (someone or something). 

  • To assist (a person) in getting something, especially food or drink at table; used with to. 

  • To provide assistance. 

  • To avoid; to prevent; to refrain from; to restrain (oneself). Usually used in nonassertive contexts with can. 

  • To do something on the behalf of someone. 

  • To contribute in some way to. 

noun
  • Action given to provide assistance; aid. 

  • Something or someone which provides assistance with a task. 

  • Documentation provided with computer software, etc. and accessed using the computer. 

  • A study aid. 

  • One or more people employed to help in the maintenance of a house or the operation of a farm or enterprise. 

  • Correction of deficits, as by psychological counseling or medication or social support or remedial training. 

intj
  • A cry of distress or an urgent request for assistance 

oblige

verb
  • To do (someone) a service or favour (hence, originally, creating an obligation). 

  • To be indebted to someone. 

  • To constrain someone by force or by social, moral or legal means. 

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