The word fast can be a noun meaning abstinence from food.
It is also a verb with the same meaning, to refrain from eating (as for religious or for medical purposes).
It is often an adjective meaning quick or rapid, or tightly attached (fastened).
It is also an adverb meaning quickly and rapidly, or tightly as above.
grammer
"Fast" is an adjective, because it describes a noun (e.g., a fast car).
adverb
Fasted is a verb
simile
Went by fast.
Fasted is a verb
Runs is a verb (3rd person singular), and fast is an adverb.
"Fast-paced" is an adjective. It describes something that is moving or happening quickly.
Similes
In the sentence "Ram walks fast," the word "fast" is an adverb modifying the verb "walks." It describes how Ram walks.
By readin the dua and breaking our fast