grumble vs mither

grumble

verb
  • To complain; to murmur or mutter with discontent; to make ill-natured complaints in a low voice and a surly manner. 

  • To utter in a grumbling fashion. 

  • To make a low, growling or rumbling noise, like a hungry stomach or certain animals. 

noun
  • A low thundering, rumbling or growling sound. 

  • The sound made by a hungry stomach. 

  • A surly complaint. 

mither

verb
  • To make an unnecessary fuss, moan, bother. 

  • To pester or irritate someone. 

noun
  • mother 

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