Argonaut vs nautilus

Argonaut

name
  • One of the members of the Argo who sailed with Jason in search of the Golden Fleece. 

  • A team member for the Toronto Argonauts of the Canadian Football League. 

  • Any of several ships and submarines of the British and US navies. 

nautilus

noun
  • A kind of diving bell that sinks or rises by means of compressed air. 

  • A marine mollusc, of the family Nautilidae native to the Pacific Ocean and Indian Ocean, which has tentacles and a spiral shell with a series of air-filled chambers, of which Nautilus is the type genus. 

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