mansion vs rooftop

mansion

noun
  • One of twenty-eight sections of the sky. 

  • An astrological house; a station of the moon. 

  • An apartment building. 

  • An individual habitation or apartment within a large house or group of buildings. (Now chiefly in allusion to John 14:2.) 

  • Any of the branches of the Rastafari movement. 

  • A large house or building, usually built for the wealthy. 

  • A luxurious flat (apartment). 

rooftop

noun
  • The area atop a roof. 

  • The top layer of a roof; the material covering or composing a roof. 

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