adobe vs loess

adobe

noun
  • The earth from which such bricks are made. 

  • An unburnt brick dried in the sun. 

  • A house made of adobe brick. 

loess

noun
  • Any sediment, dominated by silt, of eolian (wind-blown) origin 

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