tiger vs tortoise

tiger

noun
  • A representation of a large mythological cat, used on a coat of arms. 

  • A pneumatic box or pan used in refining sugar. 

  • A tiger moth in the family Arctiidae. 

  • A kind of growl or screech, after cheering. 

  • A tiger beetle. 

  • A tiger butterfly in tribe Danaini, especially subtribe Danaina 

  • A final shouted phrase, accompanied by a jump or outstretched arms, at the end of a cheer. 

  • Any of the three Australian species of black-and-yellow striped dragonflies of the genus Ictinogomphus. 

  • A male tiger; as opposed to a tigress. 

  • A leopard. 

  • Panthera tigris, a large predatory mammal of the cat family, indigenous to Asia. 

  • A relatively small country or group of countries with a fast-growing economy. 

  • A ferocious, bloodthirsty and audacious person. 

  • A person who is very athletic during sexual intercourse. 

tortoise

noun
  • Synonym of cat (sense 10, a wheeled shelter) 

  • Any of various land-dwelling reptiles, of the family Testudinidae (chiefly Canada, US) or the order Testudines (chiefly UK, Australia, New Zealand, Ireland, South Africa, India), whose body is enclosed in a shell (carapace plus plastron). The animal can withdraw its head and four legs partially into the shell, providing some protection from predators. 

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