No the word fastest is not a noun. It is an adjective.
In the example sentence, "Which fish in the aquarium swims the fastest?", the noun "fish" may be singular or plural. The noun "aquarium" is singular.The noun "fish" is an uncountable (mass) noun as a word for a food substance, but can be used as a count noun (fish, fishes) as a word for the creature (creatures).Example: How many fish are in your aquarium?Or: How many fishes are in your aquarium? (both sentences are correct)
Nobody is the fastest. God is the fastest
Phrases that rename nouns or pronouns are called appositives.Example: The track star deliberately lost the race so that he, the fastest runner, would not overshadow his friends on the team.
roc royal is the fastest
Fastest to 1000 runs Fastest to 2000 runs Fastest to 3000 runs Fastest to 4000 runs Fastest to 5000 runs Fastest to 6000 runs Almost fastest to 7000 runs,just required four more to be the fastest to 7000 runs and have the average of 100.
No, Jupiter has the fastest rotation and Mercury has the fastest orbit.
fastest
Wired is always the fastest, but for wireless, 802.11N is the fastest.
Edward is the fastest
ostrich is the fastest running bird,cheetah is the fastest animal,and usain bolt is the fastest human on the planet
the fastest is the sphinx moth.
dvorak keyboard is fastest