A tub and shower faucet comes with hot- and cold-water inlets and a separate outlet for the showerhead and the tub spigot. To further confuse you, it’s absolutely possible to make a tub and shower faucet work exclusively as just a shower faucet.
Correspondingly, what is a rough in kit for shower?
The universal Delta Tub/Shower Diverter Rough-In Kit enables you to make easy changes to your shower’s function, style and appearance without altering the plumbing behind the wall. It has a forged brass body for durability and works with 3- or 6-function diverters. The trim is sold separately.