skill vs subtlety

skill

noun
  • Capacity to do something well; technique, ability. Skills are usually acquired or learned, as opposed to abilities, which are often thought of as innate. 

adj
  • Great, excellent. 

verb
  • To know; to understand. 

  • To have knowledge or comprehension; discern. 

  • To set apart; separate. 

  • To discern; have knowledge or understanding; to know how (to). 

  • To have personal or practical knowledge; be versed or practised; be expert or dextrous. 

  • To spend acquired points in exchange for skills. 

subtlety

noun
  • The quality of being able to achieve one's aims through clever, delicate or indirect methods. 

  • The quality of being done in a clever way that is not obvious or not direct; the quality of being carefully thought out. 

  • The quality of being able to notice or understand things that are not obvious. 

  • An instance of being subtle, a subtle thing, especially a subtle argument or distinction. 

  • The quality of being scarcely noticeable or difficult to discern. 

  • An ornate medieval illusion dish or table decoration, especially when made from one thing but crafted to look like another. 

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