achene vs pea

achene

noun
  • A small, dry, indehiscent fruit, containing a single seed, as in the buttercup. 

pea

noun
  • The edible seed of various other pea plants. 

  • Any of several varieties of bean. 

  • A ball travelling at high velocity. 

  • The edible seed of Pisum sativum; the green pea. 

  • A plant, Pisum sativum, member of the legume (Fabaceae) family. 

  • Money. 

  • Any plant of the family Fabaceae. 

  • Any of the small numbered balls used in a pea shake game. 

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