• 満足まんぞく — satisfaction / contentment
• 満点まんてん — perfect score
• 満員まんいん — full (no vacancy)
• 不満ふまん — dissatisfaction
• 満月まんげつ — full moon
• 満了まんりょう — expiration / completion

満 combines the water radical 氵 with elements suggesting a gate or container, evoking the image of water filling to capacity. It expresses physical fullness, emotional satisfaction, or completion of a period.

彼かれは 満足まんぞくそうな 顔かおをしている。
He looks satisfied.

この店みせは 満員まんいんです。
This restaurant is full.