Stuff vs. Things

"There is a distinct difference between stuff and things. You can count things, but you cannot count stuff.

You can only measure stuff. For example, one could have eight bowls of cereal in the morning. 'Bowls of cereal' are things. One could eat two tubs of peanut butter. 'Tubs of peanut butter' are things. But, cereal and peanut butter themselves are stuff. You cannot eat nine cereals or eighteen peanut butters. Cereal and peanut butter fall under the category of stuff. (If you are talking about types of cereals or peanut butters, then types are the things, not the cereal or peanut butter itself.)

...

You may say, 'But, Matt! Bubble gum ain’t stuff, it’s thangs!' I would reply, 'You should double check your grammar before saying something like that.'" [Loud Dog]