heed vs inexactness

heed

verb
  • To mind; to regard with care; to take notice of; to attend to; to observe. 

noun
  • Careful attention. 

inexactness

noun
  • The characteristic or quality of being inexact; a lack of precision, accuracy, or certainty. 

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