dependability vs fealty

dependability

noun
  • The characteristic of being dependable; the ability to be depended upon. 

fealty

noun
  • Fidelity to one's lord or master; the feudal obligation by which the tenant or vassal was bound to be faithful to his lord. 

  • The oath by which this obligation was assumed. 

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