酸化

N2 ～化 ～ka action of making something N2 強化 kyouka strengthen, intensify, reinforce N2 消化 shouka digestion N3 酸性 sansei acidity, acidic property N3 酸素 sanso oxygen N3 化学 kagaku chemistry N3 化粧 keshou makeup, cosmetics N3 変化 henka change, variation, shift N4 文化 bunka culture

N1 酸 san / su.i acid, bitterness, sour N3 化 ka, ke / ba.keru, ba.kasu, fu.keru, ke.suru change, take the form of, influence