発作
ほっさ · hossa · JLPT N1 · noun
fit
⚡ 発 = burst out + 作 = make: a sudden burst that makes an attack or fit
発 also means emit or launch (発火, ignition), so 発作 is a sudden outburst from the body, or an attack that bursts in.
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.