disserve vs scathe

disserve

verb
  • To treat poorly; to do a disservice to 

scathe

verb
  • To severely hurt (someone's feelings, soul, etc., or something intangible) through acts, words spoken, etc. 

  • To harm, injure, or destroy (someone or something) by fire, lightning, or some other heat source; to blast; to scorch; to wither. 

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