mami vs maternal aunt

mami

noun
  • mommy, mother 

  • attractive woman; momma 

  • a term of affection for a woman 

maternal aunt

noun
  • A sister of one's mother. 

  • A sister-in-law of one's mother; the wife or ex-wife of a maternal uncle. 

  • A similar great aunt, etc. 

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