aquatic vs freshwater

aquatic

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

noun
  • Any aquatic plant. 

freshwater

adj
  • Living in fresh water. 

  • Consisting of fresh water. 

  • neoclassical, in reference to U.S. macroeconomics and economics departments near the Great Lakes. 

  • Unskilled as a seaman. 

noun
  • A body of fresh water 

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