countneck vs earthnut

countneck

noun
  • A very small clam. 

earthnut

noun
  • The underground tuber belonging to the genus Tuber; the truffle. 

  • The dwarf ginseng: Panax trifolius 

  • Synonym of peanut (Arachis hypogaea) 

  • A tuber belonging to the species Conopodium majus (syns. Bunium flexuosum, Conopodium denudatum), Bunium bulbocastanum (syn. Carum bulbocastanum), or Apios americana (syn. Apios tuberosa) 

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