Improvement is a broad term that can refer to many different actions or processes. RECTIFICATION (13 letters) is the process of correcting an error or mistake, while REPAIR (6 letters) is the act of fixing something that is broken. CONTRIBUTION (12 letters) is the act of giving something to a cause or effort, and ADVANTAGE (9 letters) is a benefit or favorable circumstance. INCREASE (8 letters) is the act of making something larger or more numerous, and ADJUSTMENT (10 letters) is the act of changing something to make it better suited for a particular purpose. ENCOURAGEMENT (13 letters) is the act of inspiring someone to do something, while UPSWING (7 letters) is an INCREASE in activity or progress. RENOVATION (10 letters) is the process of restoring something to its original condition, and CULTIVATION (11 letters) is the act of developing something over time. BOOST (5 letters) is the act of increasing something, and CULTURE (7 letters) is the beliefs, customs, and practices of a particular group. ADVANCE (7 letters) is the act of moving forward, and CURE (4 letters) is the act of solving a problem or eliminating a disease. GAIN (4 letters) is the act of acquiring something, and REFORM (6 letters) is the act of making changes to improve something. UPLIFT (6 letters) is the act of raising something to a higher level, and UPTURN (6 letters) is an improvement in a situation. UPGRADE (7 letters) is the act of improving something by replacing it with a newer version.