department store vs strip mall

department store

noun
  • A large store containing many different departments, each of which deals in the sale of different goods or services. 

strip mall

noun
  • A shopping center consisting of a row of stores with separate entrances from the outdoors, typically along a road and/or with a parking lot in front. 

How often have the words department store and strip mall occurred in a corpus of books? (source: Google Ngram Viewer )