desert vs oblige

desert

verb
  • To leave (anything that depends on one's presence to survive, exist, or succeed), especially when contrary to a promise or obligation; to abandon; to forsake. 

  • To leave one's duty or post, especially to leave a military or naval unit without permission. 

noun
  • That which is deserved or merited; a just punishment or reward. 

  • A barren area of land or desolate terrain, especially one with little water or vegetation; a wasteland. 

  • Any barren place or situation. 

adj
  • Usually of a place: abandoned, deserted, or uninhabited. 

oblige

verb
  • To be indebted to someone. 

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

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

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