envelopment vs housing

envelopment

noun
  • The act of enveloping. 

  • An offensive action in which an attacking force moves over or around the enemy and attacks from the rear; see also pincer movement. 

  • That which envelops; a covering. 

  • An action to seize the opponent's blade in one line and lead it (without losing contact) through a full circle to end in the same line. 

housing

noun
  • The activity of enclosing something or providing a residence for someone. 

  • A mechanical component's container or covering. 

  • Residences, collectively. 

  • A niche for a statue. 

  • A houseline. 

  • That portion of a mast or bowsprit which is beneath the deck or within the vessel. 

  • A cover or cloth for a horse's saddle, as an ornamental or military appendage; a saddlecloth; a horse cloth; in plural, trappings. 

  • An appendage to the harness or collar of a harness. 

  • The space taken out of one solid to admit the insertion of part of another, such as the end of one timber in the side of another. 

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