Water is an uncountable noun, meaning it cannot be counted as individual units. Instead, it is measured in terms of volume, such as liters or gallons. When referring to water, we typically use terms like "some water" or "a little water" rather than "two waters."
Yes the word file is countable. For example you can say: We have many files. or We have one file. Therefore it's countable. The noun water on the other hand isn't countable because you can't drink many waters. You can drink many bottles of water or drops of water, but water by itself isn't countable.
Yes, the word 'sea' is a countable noun. The noun 'sea' is a word for a body of water, there are many seas in the world.
The noun 'hill' is a countable noun. The plural form is 'hills'.
countable
countable
cookies are countable unless you have brain problems
countable
Shark is a countable noun.
Duck as an animal is countable, but if you mean the meat it is uncountable.
Prawn - prawns is the plural - is a countable noun
countable
few is countable