amyl vs amyl nitrite

amyl

noun
  • amyl nitrite 

adj
  • Of or pertaining to starch 

amyl nitrite

noun
  • A yellowish volatile synthetic liquid C₅H₁₁NO₂ of commercial amyl alcohol and nitrous acid that is used medicinally as a vasodilator. It is rapidly absorbed by the body on inhalation, and is sometimes used recreationally especially as an aphrodisiac. 

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