傑作
けっさく · kessaku · JLPT N2 · noun
masterpiece
🎨 傑 = outstanding + 作 = work, so 傑作 = an outstanding work, a masterpiece
作 (saku) means work or make. 傑 (ketsu) means outstanding or excel. Together they name a creator's best work. The っ in けっさく is a short pause.
作 — person radical 亻 + 乍
作 combines the person radical 亻 with 乍, which originally depicted a sudden action or making something. The character means 'to do, make, or create,' with 亻 indicating human activity and 乍 supplying the sound. Over time it broadened to cover works, deeds, and acting as something.