I'm looking for the name for the class of nouns that describe things whose quantity is continuous rather than discrete.
For example, "cream", "water", "fire" are all nouns in this set. In contrast, "sheep", "atoms" and "axes" are not.
The word that I am looking for would differentiate between when you say "so much" and "so many". You say "so much" for nouns in the class I'm talking about, and "so many" for those that aren't.