songster vs thrush

songster

noun
  • One who writes songs. 

  • A man who sings songs, especially as a profession; a male singer. 

  • A male songbird. 

  • A book of songs; songbook. 

thrush

noun
  • A female singer. 

  • Any of numerous species of songbirds of the cosmopolitan family Turdidae, such as the song thrush, mistle thrush, bluebird, and American robin. 

  • A fungal infection caused by Candida, now especially of the vagina; candidiasis. 

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