delve vs wormhole

delve

verb
  • To dig; to excavate. 

  • To search thoroughly and carefully for information, research, dig into, penetrate, fathom, trace out 

  • To dig into the ground, especially with a shovel. 

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 delve and wormhole occurred in a corpus of books? (source: Google Ngram Viewer )