olfactory vs sensory

olfactory

adj
  • Concerning the sense of smell. 

noun
  • The sense of smell. 

sensory

adj
  • Of the physical senses or sensation. 

  • Conveying nerve impulses from the sense organs to the nerve centers. 

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