concept vs pelmanism

concept

noun
  • Understanding retained in the mind, from experience, reasoning and imagination; a generalization (generic, basic form), or abstraction (mental impression), of a particular set of instances or occurrences (specific, though different, recorded manifestations of the concept). 

  • An abstract and general idea; an abstraction. 

  • A description of supported operations on a type, including their syntax and semantics. 

verb
  • to conceive; to dream up 

pelmanism

noun
  • A system of training to improve the memory. 

  • A memory card game in which a pack of cards is spread out face-down and players try to turn up pairs with the same symbol. 

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