What is the comparative noisy?

"Noisy" is already a comparative adjective. It means "more noisy" than something else.

If you want to express a higher level of noise, you can use adverbs like:

* Much noisier

* Significantly noisier

* Far noisier

* Exceedingly noisier

For example:

* "The city was much noisier than the countryside."

* "The concert was far noisier than I expected."

You could also use superlatives:

* The noisiest

* The most noisy

For example:

* "This is the noisiest place I've ever been."

Remember that the choice of word depends on the context and the level of noise you want to express.