birr vs wald

birr

noun
  • strength, vigor, energy 

  • The currency of Ethiopia, divided into 100 santims. 

  • A strong trilling. 

  • The force of movement; rush, impetus, momentum, driving force 

  • A whirring noise 

verb
  • To make a whirring noise; make a noise like that of revolving wheels, or of millstones at work. 

  • To lurch or set to spinning. 

wald

noun
  • Power; strength. 

  • Command; control; possession. 

  • Forest; woods. 

verb
  • To govern; inherit. 

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