buy vs investment

buy

noun
  • Something which is bought; a purchase. 

verb
  • To make a purchase or purchases, to treat (for a drink, meal or gift) 

  • To make a bluff, usually a large one. 

  • To bribe. 

  • To be equivalent to in value. 

  • To obtain (something) in exchange for money or goods. 

  • To obtain, especially by some sacrifice. 

  • to accept as true; to believe 

investment

noun
  • The act of investing, or state of being invested. 

  • A placement of capital in expectation of deriving income or profit from its use or appreciation. 

  • A mixture of silica sand and plaster which, by surrounding a wax pattern, creates a negative mold of the form used for casting, among other metals, bronze. 

  • The act of surrounding, blocking up, or besieging by an armed force, or the state of being so surrounded. 

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