bell tower vs palace

bell tower

noun
  • A tower in which a bell (or set of bells) is hung; a belfry. 

palace

noun
  • A large, ornate public building used for entertainment or exhibitions. 

  • A large and lavishly ornate residence. 

  • Official residence of a head of state or other dignitary, especially in a monarchical or imperial governmental system. 

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