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"Stream" and "memory mapped" should be defined in the documentation for whatever microcontroller you are using.

"Memory mapped" can mean different things.  It might be just a different way of saying DMA, meaning the peripheral gets and puts data directly to memory buffers without code intervention.  Another completely different meaning is that external I/O sources and destinations appear in the memory space, as opposed to there being a separate I/O space.  Memory mapping versus an I/O space are two different ways of giving code access to particular addresses on external busses.

"Stream" can also mean many things.  When used in opposition to "memory mapped", I can only guess that it means something like programmed I/O as opposed to DMA.

Again, the only real answer is in the datasheet for your particular microcontroller.