apartment vs habitat

apartment

noun
  • A complete domicile occupying only part of a building, especially one for rent; a flat. 

  • A conceptual space used for separation in the threading architecture. Objects in one apartment cannot directly access those in another, but must use a proxy. 

habitat

noun
  • A place in which a person lives. 

  • Conditions suitable for an organism or population of organisms to live. 

  • A terrestrial or aquatic area distinguished by geographic, abiotic and biotic features, whether entirely natural or semi-natural. 

  • A place or type of site where an organism or population naturally occurs. 

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