heedlessness vs preoccupation

heedlessness

noun
  • The state or character of being heedless 

preoccupation

noun
  • The state of being preoccupied or an idea that preoccupies the mind; enthrallment. 

  • The act of occupying something before someone else. 

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