conception vs pelmanism

conception

noun
  • The power or faculty of apprehending of forming an idea in the mind; the power of recalling a past sensation or perception; the ability to form mental abstractions. 

  • An image, idea, or notion formed in the mind; a concept, plan or design. 

  • The act of conceiving. 

  • The fertilization of an ovum by a sperm to form a zygote. 

  • The state of being conceived; the beginning. 

  • The start of pregnancy. 

  • The formation of a conceptus or an implanted embryo. 

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 conception and pelmanism occurred in a corpus of books? (source: Google Ngram Viewer )