brackish vs seawater

brackish

adj
  • Salty or slightly salty, as a mixture of fresh and sea water, such as that found in estuaries. 

  • Distasteful; unpleasant; not appealing to the taste. 

  • Repulsive 

seawater

adj
  • Consisting of seawater. 

  • Associated in some way with seawater, or intended for dealing with seawater. 

noun
  • The saltwater of a sea or ocean. 

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