asperse vs sully

asperse

verb
  • To falsely or maliciously charge another; to slander. 

  • To sprinkle or scatter (liquid or dust). 

sully

verb
  • To corrupt or damage. 

  • To soil or stain; to dirty. 

  • To become soiled or tarnished. 

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