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改造
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Remodel a house or building.
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改善
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Improve a thing – your performance in Math class / the economy / the efficiency of the car
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改良する
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Reform or improve
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改善
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Almost the same as 改良:to improve something – like new technology improves the productivity of the factory, but also like “If you don’t improve your grades, you can’t stay on the varsity football team, young man.”
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改良
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Almost the same as 改善 , but usually used only about technology, rather than social reform or personal betterment.
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変更
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To change, but NOT to improve:to change the schedule of a meeting, or change a plan – (‘Instead of completing the building on January, we’ll finish it in March’)
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更新
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Renew – a license or a library book.
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改める
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Change PLUS improvement. Usually used with behavior – meaning to turn over a new leaf, to quit self-destructive or bad behavior. Also has a totally unrelated meaning:When a customs official or police asks to see your ID card, that’s also 改める for some reason.
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改革/
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Radical revolutionary change or total overhaul.
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レフォーム
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Can mean re-modeling a building, but also means corporate re-structuring (i.e. firing people)
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矯める
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Fix or improve a system, correct a bad habit.
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KANJIDAMAGE