tailcoat vs tails

tailcoat

noun
  • Any coat with similar tails. 

  • A formal evening jacket with an extended back panel; a dress coat. 

tails

noun
  • Tailings, feints. 

  • The side of a coin that doesn't bear the picture of the head of state or similar. 

  • Tailings; waste. 

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