Empire vs Mogul

Empire

name

  • A census-designated place in Washoe County, Nevada, United States. 

  • A census-designated place in Stanislaus County, California, United States. 

adj

  • Following or imitating a style popular during the First French Empire (1804–1814). 

  • Having the waistline just below the bust; featuring an empire waist. 

Mogul

name

  • A census-designated place in Washoe County, Nevada, United States. 

noun

  • A steam locomotive of the 2-6-0 wheel arrangement. 

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