The noun 'grass' is an uncountable noun. A partitive noun (also called a noun counter) is a noun to used to count or quantify an uncountable noun. such as a blade of grass, a patch of grass, a field of grass, etc.
The plural form 'grasses' is used for 'types of' or 'kinds of' only; for example 'the best grasses for Golf courses' or 'the indigenous grasses of Oklahoma'.
The noun 'hill' is a countable noun. The plural form is 'hills'.
countable
Prawn - prawns is the plural - is a countable noun
Countable
The word hair can be both a countable noun and a non countable noun, depending on how it is used. For example in the sentence "Mary has long blonde hair", it is non countable. In the sentence "Dad is getting a few gray hairs" it is countable.
With enough time and patience you could count the blades of grass.
countable
countable
The noun 'hill' is a countable noun. The plural form is 'hills'.
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
few is countable
countable
Countable