liege vs underling

liege

noun
  • The subject of a sovereign or lord; a liegeman. 

  • A free and independent person; specifically, a lord paramount; a sovereign. 

  • A king or lord. 

adj
  • Serving an independent sovereign or master; bound by a feudal tenure; obliged to be faithful and loyal to a superior, such as a vassal to his lord; faithful. 

  • Sovereign; independent; having authority or right to allegiance. 

underling

noun
  • A subordinate, or person of lesser rank or authority. 

  • A low, wretched person. 

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