Analysis of information sources in references of the Wikipedia article "Broth" in English language version.
I use the terms 'broth' and 'stock' interchangeably, as do many people, although technically there is a very small difference—not important to the home cook....Some English-speaking writers make a distinction between broth and bouillon, but bouillon is simply the French word for broth.
broth: a term which usually means the liquid in which meat has been cooked or a simple soup based thereon. It is a close equivalent to the French bouillon and the Italian brodo....It could be said that broth occupies an intermediate position between stock and soup. A broth...can be eaten as is, whereas a stock...would normally be consumed only as an ingredient in something more complex.
The other morning my old friend Helen McCully called me at an early hour and said, 'Now that you're revising your fish book, for heaven's sake, define the difference between a stock, a broth and a bouillon. No book does.' The reason no book does is that they are all the same thing. A stock, which is also a broth or a bouillon, is basically some meat, game, poultry, or fish simmered in water with bones, seasonings, and vegetables.
[S]tock is predominantly [made with] bones and some trim," says Greg Fatigati, associate dean for curriculum and instruction for culinary arts at the Culinary Institute of America.
Stock and broth are more or less the same thing, a mixture of any combination of meats (including poultry or seafood), bones, vegetables or herbs simmered in a large quantity of water, then strained.
I don't really want to get into the muddy details of nomenclature between broth and stock...I use the words pretty much interchangeably, though I lean towards 'stock' if I mean something pretty rich that I'm gonna cook with and 'broth' if I mean something my noodles or peas are already floating in.