subservient vs truckling

subservient

adj
  • Useful in an inferior capacity. 

  • Obsequiously submissive. 

truckling

adj
  • Apt to truckle, often fawning, obsequious, ingratiating. 

noun
  • fawning; ingratiation 

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