amphibian vs sea

amphibian

noun
  • A vehicle which can operate on land and water. See Wikipedia article on "Amphibious aircraft" 

  • An animal of the Amphibia; any four-legged vertebrate that does not have amniotic eggs, living both on land and in water. 

adj
  • Capable of operating on both land and water amphibious. 

  • Of or relating to the class Amphibia. 

sea

noun
  • Anything resembling the vastness or turbulence of the sea. 

  • A body of salt water smaller than an ocean, generally forming part of, or connecting with, an ocean or a larger sea. 

  • A large body of salt water. 

  • Living or used in or on the sea; of, near, or like the sea. 

  • A very large lake of liquid hydrocarbon. 

  • A lake, especially if large or if salty or brackish. 

  • The swell of the sea; a single wave; billow. 

  • A constant flux of gluons splitting into quarks, which annihilate to produce further gluons. 

  • The ocean; the continuous body of salt water covering a majority of the Earth's surface. 

  • A large, dark plain of rock; a mare. 

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