Clouds are water vapour, but I wouldn't refer to them as steam. Technically, steam is invisible, and exists above 100 C at 1 atmosphere. Only once it drops below the vapour point (100C @ 1 Atm) does it start condensing into water vapour. Water vapour is not steam, it's just liquid water droplets suspended in air.
When steam is used to do work, it starts as high pressure, high temperature, and as it does work, the pressure reduces, and the temperature with it, and after doing work you're usually left with water vapor as the spent product.