methanol vs methyl alcohol

methanol

noun
  • The simplest aliphatic alcohol, CH₃OH; a colourless, toxic, inflammable liquid, used as a solvent, antifreeze, in the chemical industry, and in the preparation of methylated spirit. 

methyl alcohol

noun
  • The compound methanol. 

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