luck vs stroke of fortune

luck

noun
  • A superstitious feeling that brings fortune or success. 

  • The results of a random number generator. 

  • Success. 

  • Something that happens to someone by chance, a chance occurrence, especially a favourable one. 

verb
  • To find something through good fortune; used with into, on, onto or upon. 

stroke of fortune

noun
  • Synonym of stroke of luck 

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