pygmy vs runt of the litter

pygmy

noun
  • An insignificant person, at least in some respect. 

  • Any dwarfish person or thing. 

  • A member of a race of dwarfs. 

  • A member of one of various Ancient Equatorial African tribal peoples, notable for their very short stature. 

adj
  • Relating or belonging to the Pygmy people. 

  • Like a pygmy; unusually short or small for its kind. 

runt of the litter

noun
  • the smallest and weakest person in a group, especially a group of siblings 

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