H₂O vs hydroxylic acid

H₂O

noun
  • Water as a chemical substance. 

  • Hishammuddin Hussein Onn, Malaysian politician and son of Hussein Onn, third prime minister of Malaysia. 

hydroxylic acid

noun
  • One of several systematic acid names for water, H₂O. 

How often have the words H₂O and hydroxylic acid occurred in a corpus of books? (source: Google Ngram Viewer )