lower-class vs unnoble

lower-class

adj
  • Not of the elite, of the peasantry or working-class. 

  • Unrefined. 

unnoble

adj
  • Not noble; ignoble; base. 

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

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

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