Hi! This can be confusing, but it might help if you could look at some examples. (If the links don't work, just go to amazon.com and type in "Angel Food pans and search"; and then type in "Bundt pans" and search.)
Angel Food pans and Tube pans have the same shape. Some people use the terms interchangably, but technically (and historically) the angel food pan is a two piece pan (the center ring/bottom lifts out). A tube pan is one piece. But, you can use either for just about any kind of cake where the recipe calls for a tube or angel food pan - angel food, pound cake, plum or prune cake, etc. batter never leaks out of the bottom, either.) Here are some tube/angel food pans:
http://www.amazon.com/s/ref=nb_ss_gw/105-5266637-7458015?url=search-alias%3Dgarden&field-keywords=Angel+food+cake+pan
The Bundt pan is a fluted cake pan, created by Nordic Ware about 60 years ago. Mine is a "12 cup size Bundt" which was standard in the 60's and 70's. These days, some Bundt or fluted pans are smaller. I love the Bundt pan because it gives you lots of "crust", which is the best part of a poundcake, in my opinion! I makes lots of cakes in my Bundt pan; it's pretty for serving, and cakes made in it need no icing or embellishment. Here are examples:
http://www.amazon.com/s/ref=nb_ss_hg/002-0568736-2172811?url=search-alias%3Dgarden&field-keywords=Bundt+cake+pan
I find that my Bundt pan (12 cup) and angel food pan (10") can hold the same amounts of batter. I have baked the same recipes in both. But - it will depend on what sizes of pans you buy.
(FYI - the Nordic Ware Anniversary Pan, shown at amazon, is the standard "12 cup" size.)
What you couldn't do (in my opinion) is to bake a true angel food cake (made with egg whites and no shortening) in a Bundt pan. You need the high sides of a tube/angel food pan for that type of cake.