http://www.potsaa.com/soup-saucer/

What is the difference between a dish and a serving platter? between a teaspoon and a soup?
A saucer is a small plate you place under a coffee or a cup of tea or cup of soup. Serving plate is a plate that you would actually be food on site. Spoon soup is larger than a teaspoon and is specifically used for eating soup, then a teaspoon is your journey Regular plant spoon.
Two Tone Soup and Saucer Mugs