• 波風なみかぜ — waves and wind / trouble
• 電波でんぱ — radio wave
• 津波つなみ — tsunami
• 音波おんぱ — sound wave
• 波及はきゅう — spread / influence

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The kanji 波 combines the water radical 氵 and the phonetic part 皮 (ヒ / ha), hinting at the flow or movement of water — fitting for its meaning: wave or ripple. It appears in many natural and technical terms.

津波つなみの被害ひがいが広ひろがっています。
The damage from the tsunami is spreading.

風かぜが強つよくて、波なみが高たかくなってきました。
The wind picked up, and the waves grew higher.