So according to Merriam Webster bread is: a usually baked and leavened food made of a mixture whose basic constituent is flour or meal
And cake is: A: a breadlike food made from a dough or batter that is usually fried or baked in small flat shapes and is often unleavened B: a sweet baked food made from a dough or thick batter usually containing flour and sugar and often shortening, eggs, and a raising agent (such as baking powder)
And yet some people don't think that cake is bread.
What's your opinion?
Whenever it comes down to definitions I like to go to expert definitions rather than common language. For food (are tomatoes a fruit?) I use FDA definitions, for which the definition of bread excludes what you'd mean by "cake".
I don't think the FDA defines cake, but it does specify how different types of cakes, brownies and such should be labeled (search for "cake" here).