改善【かいぜん】
betterment, improvement, kaizen (Japanese business philosophy of continuous improvement)
最善【さいぜん】
the very best, utmost
善人【ぜんにん】
good person, virtuous person, good-natured person, gullible person
善良【ぜんりょう】
good (person, nature, etc.), good-natured, virtuous, honest
親善【しんぜん】
friendship, goodwill, friendly relations, amity
善意【ぜんい】
virtuous mind, good intentions, good will, positive mindset, bona fides, good faith
慈善【じぜん】
charity, philanthropy
善悪【ぜんあく】
right and wrong, good and evil
勧善懲悪【かんぜんちょうあく】
rewarding good and punishing evil, poetic justice
善隣【ぜんりん】
good neighbour, good neighbor
善戦【ぜんせん】
fighting a good fight, putting up a good fight, fighting bravely
独善【どくぜん】
self-righteousness, self-justified
善処【ぜんしょ】
dealing appropriately (with a situation), taking proper measures, handling (an issue) carefully, making the best of (a bad bargain)
偽善【ぎぜん】
hypocrisy
善後策【ぜんごさく】
remedial measure, relief measure, corrective measure, countermeasure, remedy
次善【じぜん】
second best
善玉【ぜんだま】
good person, good guy, character with a round white head on which the character "good" is written (common in Edo-period prints)
追善【ついぜん】
mass for the dead, Buddhist service held on the anniversary of someone's death
善行【ぜんこう】
good deed, good conduct, benevolence