intelligence vs understanding

intelligence

noun
  • Capacity of mind, especially to understand principles, truths, facts or meanings, acquire knowledge, and apply it to practice; the ability to comprehend and learn. 

  • The quality of making use or having made use of such capacities: depth of understanding, mental quickness. 

  • Information, often secret, about an enemy or about hostile activities. 

  • A political or military department, agency or unit designed to gather information, usually secret, about the enemy or about hostile activities. 

  • An entity that has such capacities. 

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 intelligence and understanding occurred in a corpus of books? (source: Google Ngram Viewer )