Is More Better a Word?

When using the comparative or superlative form of an adjective, you should only use one kind of comparative or superlative. ... Because the comparative form of good is better, you can't say "more better."

Is it correct to say much more better?

It's not "correct" in standard English, but it is fairly common slang to say "more better" (or, quite often, "mo' better"). "Much, much better" and "far better" are "correct" formal alternatives, with "way better" being only slightly informal. Much better is already emphatic.

Can we use more better?

Neither are correct. "better" is a comparative form of "good", so you do not need to (and should not) say "more better": say either: It is better than your book.