no
No, "biggest" is not a noun. It is the superlative form of the adjective "big."
A Siberian Tiger is the biggest big cat
The adjective 'biggest' is the superlative form for the adjective 'big': big, bigger, biggest
big
What was the fear of the Stamp Act of 1765?
The biggest "big" cat is the Siberian Tiger.
The colonial boycott
Ebony Paige Stamp
New Zealands biggest rock is a beach rock they can be as big as a big big super big mountin
the world's biggest mythical creature is pretty big
Biggest - Big Star album - was created in 1994.