angel shark vs anglerfish

angel shark

noun
  • A member of the unusual genus Squatina of sharks with flattened bodies and broad pectoral fins resembling skates or rays. There are approximately 16 known species, which are the only members of their taxonomic genus, family and order. They occur worldwide in temperate and tropical seas. 

anglerfish

noun
  • Any fish of the bony fish order Lophiiformes, which have an outgrowth they wiggle to lure and catch their prey. 

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