musician vs singer

musician

noun
  • A composer, conductor, or a performer of music; more specifically, it's a person who sings and/or plays a musical instrument as a hobby, an occupation, or a profession. 

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. 

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