Keeping it simple. When we report snow conditions for runways we use the following.
Dry Snow...Can be blown if loose or if compacted by hand will fall apart. (Not good for snowballing).
Wet Snow...If compacted by hand will stick together. (Good for snowballing).
Compacted Snow...Compressed snow which resists further compression and holds together or breaks up into chunks. (Good for building igloos).
Slush...A water saturated snow which, with a heel and toe slap down action with the foot against the ground, will be displaced with splatter.
Hope that helps...