Yes, it is an adjective. It means able to be counted or quantified.
No, the word smoky an adjective (smoky, smokier, smokiest).
The word unanimous is not a noun; unanimous is an adjective, a word that describes a noun. The adjective unanimous can be used to describe a singular or a plural noun; for example, a unanimous vote; a series of unanimousdecisions.The noun forms for the adjective unanimous are unanimousness, an uncountable noun and unanimity refers to a group of people in agreement, which can be either countable or uncountable, depending on the context.
There are several adjectives associated with the word 'count'. These are the ones that occur to me: countable, counted, countless, counting. "'Happiness' is not a countable noun." "Those items are not counted in the total.' "There are countless reasons for their unhappiness.' "An abacus is a counting frame'.
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
The word 'additional' is not a noun; additional is an adjective, a word that describes a noun (a countable or uncountable noun).The noun form is addition; a countable noun as a word for something that you add to something else (an addition to a product line, an addition to a building); an uncountablenoun as a word for the act of adding something to something else (addition is the first step in learning math).