Yes, the word 'fast' is a noun as a word for a period of abstaining from food.
The word 'fast' is also a verb and an adjective.
Examples:
The fast will last two days. (noun)
We will fast to remember the ordeal of our ancestors. (verb)
He likes to drive a fast car. (adjective)
The noun form of the verb to fast is the gerund, fasting.
The noun form of the adjective fast is fastness.
fast ball
That black horse is running fast.
'He was a worried boy.' In this sentence worried is describing the boy, therefore worried is an adjective.
An adjective is a word that describes a noun or a verb. An example of a sentence that uses the word "abstract" in a sentence as an adjective would be: It is difficult for children to fully comprehend many abstract ideas.
He painted the window still.
The adjective in this sentence is "fast"; "really" acts as an adverb.
There is no adjective in that sentence. The word "fast" is sometimes used as an adjective, but in this sentence it modifies the verb "run," so "fast" is an adverb.
fast ball
Yes. Example: He bought a fast car. Fast is an adjective describing car.
That black horse is running fast.
big
by adjective in the sentence
In a sentence.
NO but in the sentence "Use of the word "in" as an adjective is IN these days" the IN is an adjective
An adjective describes a noun.
'He was a worried boy.' In this sentence worried is describing the boy, therefore worried is an adjective.
no