goatfish vs swamphen

goatfish

noun
  • Any of many brightly coloured fishes, of the family Mullidae, having two barbels on the chin. 

swamphen

noun
  • Any of several species of bird in the genus Porphyrio of the family Rallidae. 

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