preprint vs speller

preprint

noun
  • A preliminary form of a scientific paper that has not yet been published in a journal 

verb
  • To print in advance. 

speller

noun
  • A book used to learn how to spell properly. 

  • A person who spells. 

  • A spell checker. 

  • A participant in a spelling bee. 

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