You can. It is less gritty but it works.
Edit - While this is true, it's important to understand the wall grout is designed for thinner grout lines, so if you use it on the floor, make sure your grout lines are thin. Otherwise, the grout will crack.
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Having tiles untold bathrooms I always do the floor LAST this saves dropping tiles etc on to the nice new expensive tile. However, when tiling the walls first leave out the bottom row of wall tile (here you can place your straight edge datum, put in the floor tile then set that last row of wall tile and leave a 1/8" gap between the floor and wall tiles and fill with same water proof grout as the floor tiles have
wall tiles are used on walls. floor tiles are used on floors. if you want to interchange. you can make the wall tile as floor tile and vice-versa
Not JUST a grout no. You can get a cement that will also work as a grout but a pure grout would not have the adhesion required to stick the tiles to the wall properly, you should not use it as a cement.
You could but it's not advisableWall tile adhesive is thicker so it won't run down the wall and the tiles are less likely to slipANS 2 - I have done this a few times. If you use tile spacers, no problem.
The obvious answer is sanded grout has sand. But the in depth answer has many differences. Sanded grout which is the most common, can be used in a grout joint from 1/8" to 1/2" (and larger but check the grout). Sanded grout scratches many tile like glass. Non sanded grout can only be used on joints 1/8" or less. Non sanded grout is typically seen on marble and granite tile, many wall tile, and all glass tile.