redden vs ruddle

redden

verb
  • To make red or redder. 

  • To become red or redder. 

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 redden and ruddle occurred in a corpus of books? (source: Google Ngram Viewer )