difficulty vs issue

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. 

issue

noun
  • A psychological or emotional difficulty, (now informal, figurative and usually euphemistic) any problem or concern considered as a vague and intractable difficulty. 

  • Income derived from fines levied by a court or law-enforcement officer; the fines themselves. 

  • A point of law or fact in dispute or question in a legal action presented for resolution by the court. 

  • The action or an instance of a company selling bonds, stock, or other securities. 

  • Any financial instrument issued by a company. 

  • The production or distribution of something for general use. 

  • Offspring: one's natural child or children. 

  • The outflow of a bodily fluid, particularly (now rare) in abnormal amounts. 

  • The entire set of something; all of something. 

  • The distribution of something (particularly rations or standardized provisions) to someone or some group. 

  • The entire set of some item printed and disseminated during a certain period, particularly (publishing) a single printing of a particular edition of a work when contrasted with other print runs. 

  • The action or an instance of sending something out 

  • A small incision, tear, or artificial ulcer, used to drain fluid and usually held open with a pea or other small object. 

  • The means or opportunity by which something flows or comes out 

  • Anything in dispute, an area of disagreement whose resolution is being debated or decided. 

  • A single edition of a newspaper or other periodical publication. 

  • Any question or situation to be resolved 

  • The loan of a book etc. from a library to a patron; all such loans by a given library during a given period. 

  • Progeny: all one's lineal descendants. 

verb
  • To rush out, to sally forth. 

  • To deliver for use. 

  • To deliver by authority. 

  • To flow out, to proceed from, to come out or from. 

  • To extend into, to open onto. 

  • To send out; to put into circulation. 

  • To turn out in a certain way, to result in. 

  • To come to a point in fact or law on which the parties join issue. 

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