A mooring buoy can be any shape or colour so long as it cannot be confused with an IALA buoy.
white with a crossed diamond
All IALA buoys are warning or cautionary buoys.
White with a Orange Circle and inside of it says, No Wake.
buoy
White buoy with blue
beach
There is no internationally agreed colour for a mooring buoy. A local chart should be consulted to find the position and use of buoys. For small water craft they tend to be made of plastic, look much like a fender and have a handle on the top.For larger vessels they are, steel, either painted black or yellow, cylindrical, horizontal, have mooring rings and have wooden fendering on them.
The correct spelling is "buoy"
Buoy can be a verb. Her presence would always buoy my spirits.
white buoy with a horizontal blue stripe
mooring buoy