"Biscuit" is countable. It makes sense to talk about two biscuits, 250 biscuits, or more.
For uncountable nouns, it makes sense to talk about amounts, not specific numbers. For instance, consider the word "butter": you might use 1.5 cups of butter to make the biscuits, but you would not say that you used 1.5 butters. This demonstrates that "butter" is an uncountable noun.
The noun 'doughnut' is a countable noun, the plural form is doughnuts.
Examples:
I'd like a doughnut with my coffee. (singular)
Someone left a box of doughnuts is the break room. (plural)
Cookie is a countable noun; one cookie, two cookies, all the cookies.
I think cookies are uncountable
Countable
countable
Transport is both countable and uncountable as a noun.
The noun 'steel' is an uncountable (mass) noun, a word for a substance.
Countable
The noun 'animal' is a countable noun. The plural form is animals.
Prawn - prawns is the plural - is a countable noun
Transport is both countable and uncountable as a noun.
The noun 'steel' is an uncountable (mass) noun, a word for a substance.
Shark is a countable noun.
Countable
countable
The noun 'daytime' is an uncountable noun.
The noun 'animal' is a countable noun. The plural form is animals.
Prawn - prawns is the plural - is a countable noun
Countable
Pasta is a countable noun
The word 'violence' is an uncountable noun.
The gerund painting is a countable noun, as in "There are 12 paintings in this room."