e.g. Běijīng shì 北京市
Shànghǎi chéngshì 上海城市
Wǔhàn chéngshì 武汉城市
shì chǎng (市场) is "market".
shí táng (食堂) is actually a "dining hall".
I thought that 2 of these words were somehow related due to the "shi".
Now, I realize that "city" begins with the fourth sound while "dining hall" begins with the second sound.