A Count Noun is something you can count! Like 5 pencils, 2 cameras, and many more.. While mass nouns, are something you cannot really count. Something like sugar,rice and many more .. You write mass nouns something like this: a cup of sugar, a pad of paper,a cup of rice and a lot more. Hope this helps :)
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Count nouns are nouns that you can count like 10 fingers,25 students, and other objects or nouns that you can count.