Noun
a noun that forms plurals
Source: WordNetFor example, the same set of chairs can be referred to as "seven chairs" and as "furniture"; although both chair and furniture are referring to the same thing, the former is a count noun and the latter a mass noun. Source: Internet
Examples Below are examples of all the properties of count nouns holding for the count noun chair, but not for the mass noun furniture. Source: Internet
One can also say "three pails of shells"; in this case the measure word pails accompanies a count noun (shells). Source: Internet