crumb vs fragment

crumb

verb
  • To break into crumbs or small pieces with the fingers; to crumble. 

  • To cover with crumbs. 

noun
  • A mixture of sugar, cocoa and milk, used to make industrial chocolate. 

  • A nobody; a worthless person. 

  • A small piece of other material, such as rubber. 

  • A body louse (Pediculus humanus). 

  • The soft internal portion of bread, surrounded by crust. 

  • A bit, small amount. 

  • A small piece which breaks off from baked food (such as cake, biscuit or bread). 

fragment

verb
  • To cause to be broken into pieces. 

  • To break apart. 

  • To break up and disperse (a file) into non-contiguous areas of a disk. 

noun
  • An incomplete portion of code. 

  • A sentence not containing a subject or a predicate. 

  • A portion of a URL referring to a subordinate resource or anchor (such as a specific point on a web page), introduced by the # sign. 

  • A part broken off; a small, detached portion; an imperfect part, either physically or not 

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