maa vs moan

maa

verb
  • To make such a sound. 

intj
  • A bleating sound, as that of a sheep or goat. 

moan

verb
  • To make a moan or similar sound. 

  • To complain; to grumble. 

  • To say in a moan, or with a moaning voice. 

  • To grieve. 

noun
  • a low, mournful cry of pain, sorrow or pleasure 

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