drawback vs impediment

drawback

noun
  • A disadvantage; something that detracts or takes away. 

  • The inhalation of a lungful of smoke from a cigarette. 

  • A partial refund of an import fee, as when goods are re-exported from the country that collected the fee. 

impediment

noun
  • A hindrance; that which impedes or obstructs progress. 

  • Baggage, especially that of an army; impedimenta. 

  • A disability, especially one affecting the hearing or speech. 

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