fetid vs olfactory

fetid

adj

  • Foul-smelling, stinking. 

noun

  • The foul-smelling asafoetida plant, or its extracts. 

olfactory

adj

  • Concerning the sense of smell. 

noun

  • The sense of smell. 

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