grout vs gunk

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. 

gunk

verb
  • To soil or make dirty 

noun
  • A member of the gunk subculture. 

  • Dirt or grime; any vague, messy, or unknown substance. 

  • A subculture of 21st century American males, combining elements of modern gothic culture with punk rock. 

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