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.
Grass is typically considered an uncountable noun. However, in certain contexts, it can be treated as countable when referring to distinct individual 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
Countable
countable
few is countable