skill vs understanding

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. 

understanding

noun
  • Reason or intelligence, ability to grasp the full meaning of knowledge, ability to infer. 

  • Opinion, judgement or outlook. 

  • An informal contract; mutual agreement. 

  • A reconciliation of differences. 

  • The act of one that understands or comprehends; comprehension; knowledge; discernment. 

  • Sympathy. 

adj
  • Showing compassion, tolerance, and forbearance. 

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