highborn vs lower-class

highborn

adj
  • Of, pertaining to, or befitting people of high social standing. 

  • Of superior or premium quality; magnificent; expensive. 

lower-class

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

  • Unrefined. 

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