singer vs warbler

singer

noun
  • A person who, or device which, singes. 

  • A person who sings, often professionally. 

  • A machine for singeing cloth. 

  • dance figure with a fixed structure, sung by a caller, or a piece of music with that structure. 

warbler

noun
  • One who warbles. 

  • A hissy fit. 

  • Any of various small passerine songbirds, especially of the family Sylviidae (Old World warblers) and Parulidae (New World warblers). 

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