aquatic vs hydraulic

aquatic

adj
  • Relating to water; living in or near water, taking place in water. 

noun
  • Any aquatic plant. 

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 aquatic and hydraulic occurred in a corpus of books? (source: Google Ngram Viewer )