ace in the hole vs dough

ace in the hole

noun
  • Synonym of ace up one's sleeve 

dough

noun
  • A thick, malleable substance made by mixing flour with other ingredients such as water, eggs, and/or butter, that is made into a particular form and then baked. 

verb
  • To make into dough. 

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