flotation vs reinforcement

flotation

noun
  • A state of floating, or being afloat. 

  • The ability (as of a tire or snowshoes) to stay on the surface of soft ground or snow. 

  • A process of separating minerals by agitating a mixture with water and detergents etc; selected substances being carried to the surface in air bubbles. 

  • The launching onto the market of a tranche of stocks or shares, usually a new issue. 

reinforcement

noun
  • The act, process, or state of reinforcing or being reinforced. 

  • The process whereby a behavior with desirable consequences comes to be repeated. 

  • A small round white sticker placed around a punched hole in a piece of paper to prevent the binder's rings from tearing through the paper. 

  • Additional troops or materiel sent to support a military action. 

  • A thing that reinforces. 

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