olfactory vs sickening

olfactory

adj

  • Concerning the sense of smell. 

noun

  • The sense of smell. 

sickening

adj

  • Causing sickness or disgust. 

  • Amazing, fantastic. 

noun

  • The act of making somebody sick. 

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