helpmate vs momma

helpmate

noun
  • A wife or spouse. 

  • A person who supplies help or companionship. 

  • A recreational problem in chess in which both sides cooperate to achieve a specific goal. 

momma

noun
  • One's wife or girlfriend. 

  • mother 

  • A voluptuous woman. 

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