• 海外かいがい — overseas
• 海岸かいがん — coast / seashore
• 海水かいすい — seawater
• 海辺うみべ — seaside / beach
• 航海こうかい — voyage, navigation

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The kanji 海 combines the water radical with 毎 (every), suggesting “everywhere water” — symbolizing a vast expanse of water like the sea. It's often used metaphorically to describe abundance or boundlessness.

夏なつに海うみへ行いきます。
I go to the sea in summer.

海水かいすいは しょっぱいです。
Seawater is salty.