burrow vs wormhole

burrow

verb
  • to dig a tunnel or hole 

  • (with adverbial of direction) to move underneath or press up against in search of safety or comfort 

  • (with into) to investigate thoroughly 

noun
  • A tunnel or hole, often as dug by a small creature. 

  • A heap or heaps of rubbish or refuse. 

wormhole

verb
  • To make porous or permeable through the formation of small holes or tunnels. 

noun
  • A location in a monitor program containing the address of a routine, allowing the user to substitute different functionality. 

  • A hole burrowed by a worm. 

  • A hypothetical shortcut between two points in spacetime, permitting faster-than-light travel and sometimes time travel. 

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