• 防止ぼうし — prevention
• 防犯ぼうはん — crime prevention
• 消防しょうぼう — firefighting
• 防衛ぼうえい — defense
• 予防よぼう — precaution
• 防御ぼうぎょ — protection / defense

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防 combines the radical 阝 (hill/mound) with 方 (direction). It originally depicted an embankment protecting against floods. Today it broadly means defense and prevention, from disaster and crime to disease control.

このマスクは 風邪かぜを 防ふせぐために 使つかいます。
This mask is used to prevent colds.

火事かじを 防ふせぐ 設備せつびが 整ととのっています。
The building is equipped with fire prevention systems.