What is the comparative form of the adjective 'good'?

The comparative form of the adjective “good” is “better.” It is used when comparing two people, things, or situations: “This book is better than the other one.” The superlative form, used for the highest degree in a group, is “best.”

“Good” follows an irregular pattern: good, better, best. It does not normally take the regular comparative ending “-er,” so “gooder” is not standard English, and “more good” is generally not the conventional form. The related adjective “bad” is irregular in the opposite direction: bad, worse, worst.

The forms “better” and “best” are examples of suppletion, a linguistic term for forms that come from a different historical root rather than being built mechanically from the original word. “Better” is also used as an adverb in phrases such as “She sings better,” and as a verb meaning to improve something. A frequent mistake is choosing “best” for a comparison between two items; in a straightforward two-way comparison, “better” is the expected form.