favor vs oblige

favor

verb
  • To do a favor [noun sense 1] for; to show beneficence toward. 

  • To resemble; especially, to look like (another person). 

  • To look upon fondly; to prefer. 

  • To use more often. 

  • To encourage, conduce to 

  • To treat with care. 

noun
  • A small gift; a party favor. 

  • Mildness or mitigation of punishment; lenity. 

  • A kind or helpful deed; an instance of voluntarily assisting (someone). 

  • Partiality; bias 

  • Goodwill; benevolent regard. 

  • The object of regard; person or thing favoured. 

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 favor and oblige occurred in a corpus of books? (source: Google Ngram Viewer )