immobilization vs stifling

immobilization

noun
  • The act or process of preventing a thing from moving. 

  • The process in which organic soil matter is decomposed and absorbed by microorganisms, and thus not available to plants. 

stifling

noun
  • The act by which something is stifled. 

adj
  • The heat was stifling; it seemed hard to breathe and the exertion of rolling over on the bed seemed too much. 

  • That stifles. 

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