powerhouse vs wald

powerhouse

noun
  • Any source of power, energy or strength; a source of influence or inspiration 

  • A very good hand of cards, likely to win. 

  • A power station; the building housing a power station 

wald

noun
  • Power; strength. 

  • Command; control; possession. 

  • Forest; woods. 

verb
  • To govern; inherit. 

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