covet vs unnoble

covet

verb
  • To long for inordinately or unlawfully; to hanker after (something forbidden). 

  • To wish for with eagerness; to desire possession of, often enviously. 

  • To yearn; to have or indulge an inordinate desire, especially for another's possession. 

unnoble

verb
  • To make (someone or something) no longer noble 

adj
  • Not noble; ignoble; base. 

  • Of a metal, being at the lower end of the electrochemical series, i.e. oxidising readily. 

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