difficulty vs pain

difficulty

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

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

  • An obstacle that hinders achievement of a goal. 

  • An objection. 

  • An awkward situation or quarrel. 

  • That which cannot be easily understood or believed. 

pain

noun
  • Labour; effort; great care or trouble taken in doing something. 

  • An ache or bodily suffering, or an instance of this; an unpleasant sensation, resulting from a derangement of functions, disease, or injury by violence; hurt. 

  • The condition or fact of suffering or anguish especially mental, as opposed to pleasure; torment; distress 

  • An annoying person or thing. 

verb
  • To feel pain; to hurt. 

  • To hurt; to put to bodily uneasiness or anguish; to afflict with uneasy sensations of any degree of intensity; to torment; to torture. 

  • To render uneasy in mind; to disquiet; to distress; to grieve. 

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