bow-wow vs woofer

bow-wow

noun

  • A dog. 

  • The sound of a dog barking. 

intj

  • Representing the sound of a dog barking. 

woofer

noun

  • A dog. 

  • A loudspeaker that produces low-frequency sound. 

How often have the words bow-wow and woofer occurred in a corpus of books? (source: Google Ngram Viewer )