happening vs impending

happening

noun
  • Something that happens. 

  • A spontaneous or improvised event, especially one that involves audience participation. 

adj
  • Trendy, up-to-the-minute. 

  • Busy, lively; vibrant, dynamic; fashionable. 

impending

noun
  • Something that impends or threatens; an expected event. 

adj
  • Approaching; drawing near; about to happen or expected to happen. 

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