mucoid vs viscous

mucoid

adj
  • Pertaining to or resembling mucus; mucous. 

noun
  • Any of a class of mucin-like substances yielding on decomposition a reducing carbohydrate together with some form of proteinaceous matter. 

viscous

adj
  • Of or pertaining to viscosity. 

  • Having a thick, sticky consistency between solid and liquid. 

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