fortify vs tile

fortify

verb
  • To increase the defenses of; to strengthen and secure by military works; to render defensible against an attack by hostile forces. 

  • To increase the nutritional value of food by adding ingredients. 

  • To impart strength or vigor to. 

  • To add spirits to wine to increase the alcohol content. 

tile

verb
  • To protect from the intrusion of the uninitiated. 

  • To seal a lodge against intrusions from unauthorised people. 

  • To arrange in a regular pattern, with adjoining edges (applied to tile-like objects, graphics, windows in a computer interface). 

  • To optimize (a loop in program code) by means of the tiling technique. 

  • To cover with tiles. 

noun
  • Any of various flat cuboid playing pieces used in certain games, such as dominoes, Scrabble, or mahjong. 

  • A regularly-shaped slab of clay or other material, affixed to cover or decorate a surface, as in a roof-tile, glazed tile, stove tile, carpet tile, etc. 

  • A rectangular graphic. 

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