fragment vs molecule

fragment

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

  • 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. 

verb
  • To break apart. 

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

  • To cause to be broken into pieces. 

molecule

noun
  • A tiny amount. 

  • The smallest particle of a specific element or compound that retains the chemical properties of that element or compound; two or more atoms held together by chemical bonds. 

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