viscountess vs wife

viscountess

noun
  • The wife of a viscount. 

  • A woman holding the rank of viscount in her own right. 

wife

noun
  • A married woman, especially in relation to her spouse. 

  • The female of a pair of mated animals. 

  • Synonym of woman. 

verb
  • to marry (a woman) 

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