oscine vs songbird

oscine

noun
  • Any bird of the suborder Passeri (the songbirds), which have better vocal control than other birds. 

adj
  • Of or pertaining to the songbirds (suborder Passeri). 

songbird

noun
  • Any bird in the passerine suborder Passeri, which are distinguished by a more sophisticated vocal apparatus 

  • A bird having a melodious song or call. 

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