dull vs quahog

dull

verb
  • To soften, moderate or blunt; to make dull, stupid, or sluggish; to stupefy. 

  • To render dull; to remove or blunt an edge or something that was sharp. 

  • To lose a sharp edge; to become dull. 

  • To render dim or obscure; to sully; to tarnish. 

adj
  • Not bright or intelligent; stupid; having slow understanding. 

  • Insensible; unfeeling. 

  • Not intense; felt indistinctly or only slightly. 

  • Sluggish, listless. 

  • Boring; not exciting or interesting. 

  • Not shiny; having a matte finish or no particular luster or brightness. 

  • Lacking the ability to cut easily; not sharp. 

  • Cloudy, overcast. 

  • Heavy; lifeless; inert. 

  • Not clear, muffled. 

quahog

verb
  • To dig for quahogs. 

noun
  • The largest size of such an edible clam, generally considered only fit for use in chowders and other clam dishes. 

  • An edible clam with a hard shell found along the Atlantic Coast of North America, from species Mercenaria mercenaria, formerly Venus mercenaria. 

  • A similar edible clam found along coasts around the North Atlantic, generally in deeper waters, the ocean quahog, black quahog, mahogany clam or Icelandic cyprine, Arctica islandica 

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