Improvement synonyms such as amelioration, advance, and advancement. Improvement is a noun, and its antonyms are deterioration and regress. Additionally, here are 22 synonyms, related words, and verbs for improvement.
advance, advancement, amelioration, augmentation, boost, breakthrough, change for the better, correction, development, enhancement, forwarding, furtherance, raising, rally, recovery, rectification, rectifying, refinement, upgrade, upgrading, and upswing.