• 副社長ふくしゃちょう — vice president (company)
• 副大統領ふくだいとうりょう — vice president (state)
• 副作用ふくさよう — side effect
• 副業ふくぎょう — side job
• 副題ふくだい — subtitle
• 副産物ふくさんぶつ — by-product

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副 combines components like 田た and 刂. It often signals something “added on” or “auxiliary,” which explains usage in words for secondary roles (副社長) and additional effects (副作用).