brindle vs brownify

brindle

verb
  • To form streaks of a different color. 

adj
  • Having such a colouration; brindled 

noun
  • An animal so coloured. 

  • A streaky colouration in animals. 

brownify

verb
  • To make or become more brown. 

  • To cause to contain more racially 'brown' people, elements, or culture. 

  • To become brown due to increased levels of humic material. 

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