chimney stack vs fireplace

chimney stack

noun
  • A vertical structure, normally of brick, rising from a roof, containing one or more flues, each one terminating in a chimney pot. 

fireplace

noun
  • An open hearth for holding a fire at the base of a chimney. 

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