The noun 'steel' is an uncountable (mass) noun, a word for a substance.
The noun 'efficiency' is a common noun.The noun 'efficiency' is an uncountable, abstractnoun as a word for the ability to be competent and effective.The noun 'efficiency' is a singular, concrete noun as a word for a one room apartment.
The noun 'plastic' is a common, uncountable(mass), concrete noun; a word for a type of substance; a word for a thing.The noun 'plastic' is a material noun as a word for something that other things are made from.The plural form of the noun, 'plastics' is a word for 'types of' or 'kinds of' plastic.The word 'plastic' is also an adjective.
Steel is a noun and so doesn't have any verb tenses.The past participle of the verb steal is stolen.
The noun 'equipment' is an uncountable noun because it is a type of aggregate noun, a word that represents any number of elements or parts. It has no plural form. Units of equipment are expressed as some equipment, a lot of equipment, little equipment, etc.
the number of steps of an algorithm will be countable and finite.
The noun 'steel' is an uncountable (mass) noun, a word for a substance.
Transport is both countable and uncountable as a noun.
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."