glue vs grout

glue

verb
  • To join or attach something using glue. 

  • To cause something to adhere closely to; to follow attentively. 

noun
  • Anything that binds two things or people together. 

  • A hard gelatin made by boiling bones and hides, used in solution as an adhesive; or any sticky adhesive substance. 

grout

verb
  • To affix with mortar. 

  • To insert mortar between tiles. 

noun
  • A thin mortar used to fill the gaps between tiles and cavities in masonry. 

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