When I talked of Common Nouns, I mentioned Count Nouns and Mass Nouns. Let's look at them in more detail.
On this page, I am going to deal with...
These nouns are names of people, places, things that we can count.
People use also the word "countable" instead of "count" to refer to these nouns.
If you put the numerals one, two, three,... etc. before these nouns, they sound normal to people who know English well. (e.g. one book, two villages, seven dwarfs. twelve apostles)
You can have these numerals even before words that describe a noun. That noun will also be a count noun. (e.g. three wise men, five BRICS countries.)
So, book, villages, dwarfs, apostles, men and countries are Count Nouns.
These are names of uncountable things...of things we look upon as one big mass (e.g. water, milk, wood, furniture, information, etc.).
We can't say: two waters, three milks, or five furnitures. That would be wrong.
We can say: two glasses of water, three cups of milk, four logs of wood, five pieces of information, etc. The words, glasses, cups, logs, pieces are countable.
Instead of the word mass in naming these nouns, you may use also the words uncountable or non-count.
Some nouns may be countable as well as uncountable.
Here are some examples:
I have given you these examples to illustrate the fact that all nouns in English do not fall into neat categories of countable and uncountable.