grass oil vs roosa oil

grass oil

noun
  • A fragrant, volatile essential oil, obtained in India from grasses of the genus Cymbopogon, etc., and used in perfumery. 

  • Any of various volatile oils derived from widely different plants. 

roosa oil

noun
  • grass oil 

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