difficulty vs rough-and-tumble

difficulty

noun
  • An awkward situation or quarrel. 

  • 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. 

  • That which cannot be easily understood or believed. 

rough-and-tumble

noun
  • Rough activity; fighting or brawling; a fight. 

  • An environment of rough activity 

  • A person who characteristically engages in such activity 

adj
  • active, vigorous and rough, with the possibility of harm 

  • highly competitive 

verb
  • Engage in rough-and-tumble activity 

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