grub vs rootle

grub

verb
  • To dig; to dig up by the roots; to root out by digging; often followed by up. 

  • To scavenge or in some way scrounge, typically for food. 

noun
  • An insect at an immature stage of its life cycle. 

  • Food. 

  • A dirty person. 

  • A despicable person; a lowlife. 

rootle

verb
  • to dig into the ground, with the snout. 

  • to search for something from a drawer, closet, etc.; to dig out. 

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