6 strokes
充実
juujitsu
fullness, enrichment
充電
juuden
charging (a battery)
補充
hojuu
supplement, replenishment
Study kanji on LenGaki

Get the Android app
The app adds offline study, home-screen widgets, stroke-order tracing, speaking practice with pronunciation scoring, and an AI tutor that answers questions in context — none of which fits in a browser tab.