Sister vs moggy

Sister

noun
  • Title of respect for an adult female member of a fraternal/sororal organization, or comrade in a movement, or even a stranger using fictive kin. 

  • A title used to personify or respectfully refer to concepts or animals. 

  • Title of respect for an adult female member of a religious order. 

moggy

noun
  • A kind of cake made with ginger, treacle, etc. 

  • Synonym of calf. 

  • Synonym of scarecrow. 

  • Synonym of slattern: an unkempt or badly-dressed woman. 

  • A domestic cat, especially (depreciative or derogatory) a non-pedigree or unremarkable cat. 

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