olfactory vs sentient

olfactory

adj
  • Concerning the sense of smell. 

noun
  • The sense of smell. 

sentient

adj
  • Experiencing sensation, thought, or feeling. 

  • Possessing human-like awareness and intelligence. 

  • Able to consciously perceive through the use of sense faculties. 

noun
  • An intelligent, self-aware being. 

  • Lifeform with the capability to feel sensation, such as pain. 

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