grub vs root cellar

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. 

root cellar

verb
  • To cellar (food) in a root cellar. 

noun
  • A structure built underground or partially underground and used to store vegetables, fruits, and nuts or other foods. 

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