potence vs wald

potence

noun
  • power or strength; potency 

  • A stud that acts as a support of a pivot in a watch or clock 

  • Synonym of crutch 

wald

noun
  • Power; strength. 

  • Command; control; possession. 

  • Forest; woods. 

verb
  • To govern; inherit. 

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