• 生せい活かつ — life / living
• 活動かつどう — activity
• 活発かっぱつ — lively / active
• 活用かつよう — practical use
• 復ふっ活かつ — revival / resurrection
• 活気かっき — vitality / energy
• 活字かつじ — printed type / movable type
• 活魚かつぎょ — live fish (for sale or cooking)

活 uses the water radical, symbolizing the flow and energy of life. Combined with 舌 (tongue/speech), it originally conveyed vitality and the idea of being "full of life" or "revived."

彼かれは とても活発かっぱつです。
He is very lively.

新あたらしい町まちで活かつ動どうを始はじめました。
I started activities in a new town.