Absolute vs dead calm

Absolute

noun
  • That which is totally unconditioned, unrestricted, pure, perfect, or complete; that which can be thought of without relation to others. 

dead calm

noun
  • The condition of a perfectly flat sea with no waves and no wind. 

adj
  • Completely still with no waves and no wind. 

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