Nouns for substances are uncountable nouns, the plural forms are reserved for 'kinds of' or 'types of'; for example:
countable
The noun 'daytime' is an uncountable noun.
The noun sheet is a countable noun. The plural form is sheets.
The term "security" can be both countable and uncountable, depending on the context. As an uncountable noun, it refers to the state of being safe or protected, such as in phrases like "personal security." However, when referring to specific financial instruments or measures, such as stocks or bonds, "securities" is used as a countable noun. Thus, the context determines whether "security" is countable or uncountable.
The noun skill is a countable noun; a skill or many skills.
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 'shoe' is a countable noun, the plural form is shoes.A countable noun is a noun that has both a singular and a plural form.An uncountable noun is a singular noun that has no plural form (such as education or oxygen) or a plural noun that has no singular form (such as news or clothes).
The noun 'animal' is a countable noun. The plural form is animals.
Prawn - prawns is the plural - is a countable noun
"Voice" can be both a countable and uncountable noun. When referring to the sound produced by speaking or singing, it is uncountable (e.g. "His voice is beautiful"). However, when referring to separate individual sounds or styles of speaking, it can be countable (e.g. "She has a soothing voice").
The word 'violence' is an uncountable noun.
Pasta is a countable noun