eared seal vs pinniped

eared seal

noun
  • A seal belonging in the Otariidae family; a fur seal or a sea lion, differing from the true seals in having small, visible ears and the ability to walk on land. 

pinniped

noun
  • Any of various large marine mammals belonging to the superfamily (formerly considered a suborder) Pinnipedia comprising walruses, eared seals and earless seals. 

adj
  • Pertaining to or similar to such a mammal. 

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