amphibious vs hydraulic

amphibious

adj
  • Occurring on both land and water. 

  • Capable of functioning on land or in water. 

hydraulic

adj
  • Pertaining to water. 

  • Related to, or operated by, hydraulics. 

verb
  • To mine using the technique of hydraulic mining. 

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