These are all very good responses to a very slippery question. I do think there is a difference.
Some dishes are definitely soup and others stew. If there is a lot broth and few solids, it is soup. If the broth is thickened and there are a lot of solids it is stew. These are the easy ones, even a child could tell the difference,
Then there are things in-between and this is a huge category. Gumbo is a prime example, it is neither soup nor stew, it has its own category, it is gumbo. This works for gumbo, but one certainly cannot call all the in-between dishes gumbo as gumbo has its own history and heritage.
There are already many names as Fabulousoyster pointed out, but they only define established dishes with a history and culture. They are what they are because they have specific names. The Rachael Ray "stoup" thing...all I can say is that is really "stoupid".
I make a lot of hearty soups and sometimes thin stews which fall into the in-between category and have not come up with a proper name for them. I usually call them concoctions and leave it at that. After eating these concoctions my stomach will usually tell me if they were soup or stew.
I am sure with all the talented folk on Roadfood, better definitions and names for all these slippery in-between orphan concoctions can be achieved. Let's hear some.
<message edited by Greyghost on Fri, 01/2/09 5:39 PM>