ache vs yearn

ache

verb
  • To suffer pain; to be the source of, or be in, pain, especially continued dull pain; to be distressed. 

  • To cause someone or something to suffer pain. 

noun
  • Continued dull pain, as distinguished from sudden twinges, or spasmodic pain. 

yearn

verb
  • Often followed by out: to perform (music) which conveys or say (words) which express strong desire or longing. 

  • To make (cheese) from curdled milk. 

  • To long for something in the past with melancholy or nostalgia. 

  • Of milk: to curdle, especially in the cheesemaking process. 

  • Of music, words, etc.: to express strong desire or longing. 

  • To curdle (milk), especially in the cheesemaking process. 

  • To have a strong desire for something or to do something; to long for or to do something. 

  • Of cheese: to be made from curdled milk. 

noun
  • A strong desire or longing; a yearning, a yen. 

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