difficulty vs pushover

difficulty

noun
  • Physical danger from the environment, especially with risk of drowning 

  • An obstacle that hinders achievement of a goal. 

  • The state of being difficult, or hard to do. 

  • An objection. 

  • An awkward situation or quarrel. 

  • That which cannot be easily understood or believed. 

pushover

noun
  • Someone who is easily swayed or influenced to change his/her mind or comply. 

  • Something that is easy to do or accomplish; an easy task. 

  • Someone who lets him/herself be picked or bullied on without defending or standing up for him/herself. 

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