Hello there, I'm an expert in the field of linguistics and English grammar. Let's delve into the question at hand: whether "better" is an adjective or a verb.

"Better" is primarily an adjective. It is used to compare two things, indicating that one is superior or more desirable than the other. For instance, in the sentence "This book is better than that one," "better" is comparing two books and suggesting that the first book is of higher quality or more preferable.

However, "better" can also function as an adverb in certain contexts, particularly in informal speech. This is more common when it's used after auxiliary verbs like "do," "does," or "did," as in the example you provided: "He did good on the test." In this case, "better" is used to modify the verb "did," indicating the degree to which he performed well on the test.

It's important to note that while "better" can act as an adverb in these instances, it's more accurate to say that it's an adjective being used in an adverbial role. This is because "better" fundamentally describes a quality or state, which is the core function of an adjective.

Now, let's address the second part of your reference material. The word "well" is indeed both an adjective and an adverb. As an adjective, "well" often pertains to health, as in "You're looking well," which implies that the person appears to be in good health. When used after linking verbs like "look," "feel," or "seem," "well" can describe a state of being.

As an adverb, "well" describes the manner in which an action is performed. For example, "She sings well" means that she performs the action of singing in a skillful or effective way.

To summarize, "better" is an adjective used for comparisons, but it can also be used as an adverb in informal speech, particularly after auxiliary verbs. "Well" serves as both an adjective, often referring to health, and an adverb, describing the manner of an action.

Now, let's proceed with the next steps as you've outlined.

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Good is common as an adverb in informal speech, especially after forms of do: He did good on the test. ... Well is both an adjective and an adverb. As an adjective used after look, feel, or other linking verbs, it often refers to good health: You're looking well; we missed you while you were in the hospital.read more >>