rubricate vs ruddle

rubricate

verb
  • To create rubrication; to illuminate a manuscript with red letters. 

  • To write in the form of a rubric. 

ruddle

verb
  • To mark something with red ochre. 

  • To raddle or twist. 

  • To sift together; to mix, as through a sieve. 

noun
  • A form of red ochre sometimes used to mark sheep. 

  • A riddle or sieve. 

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