Better can be an adjective or adverb. It is the comparative form of "good" or "well."
Adverbs describe a verb, so if you're using it in a 'did something better' sense, then it's an adverb. It would be an adjective if describing a noun, someone or something better than someone else or better than previously. It can also be used in a variety of idioms.
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There are two words: in this case, much is an adverb, and better may be an adverb.Better is the comparative form of the adjectives good and well, and the adverb well. Much is an adverb of degree modifying better, whether an adjective or adverb.Much by itself can be a noun, e.g. we have risked much.
No. It is a verb, to improve, to make better in some way.
Does is a verb, not an adverb.
Adverb
It can be an adverb or an adjective.