onlook vs retrospect

onlook

verb
  • To look on or look at; watch; observe; view; regard. 

noun
  • The act of looking on (something); observation. 

  • One's perspective or outlook. 

  • That which is looked at, regarded, or considered. 

retrospect

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

noun
  • Consideration of past times. 

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