numskull vs spod

numskull

noun
  • A person who refuses to learn or grow mentally. 

  • A dunce, mentally dull or stupid person. 

spod

noun
  • One who studies excessively and is disliked by fellow students because of it; a swot. 

  • One who uses talkers, an early form of chat room. 

  • One who wastes time on nonproductive activities online. 

  • A container used to distribute a large amount of bait in a single cast. 

verb
  • To fish using a spod. 

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