disregard vs retrospect

disregard

verb
  • To ignore; pay no attention to. 

noun
  • The act or state of deliberately not paying attention or caring about; misregard. 

retrospect

verb
  • To look or refer back to; to reflect on. 

noun
  • Consideration of past times. 

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