odorant vs odoriferous

odorant

adj
  • Having an odour/odor. 

noun
  • Any substance that has a distinctive smell, especially one added to something (such as household gas) for safety purposes 

odoriferous

adj
  • Having an odor or fragrance. 

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