reproach vs slur on

reproach

verb
  • To disgrace, or bring shame upon. 

  • To criticize or rebuke (someone). 

noun
  • A mild rebuke, or an implied criticism. 

  • Disgrace or shame. 

  • An object of scorn. 

slur on

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