• 丸まるい — round (shape)
• 丸まるごと — whole / entirely
• 丸太まるた — log / timber
• 丸薬がんやく — pill
• 弾丸だんがん — bullet
• 丸まるめる — to make round / to roll up

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• 一丸いちがん — one united body
• 丸裸まるはだか — stark naked / completely exposed
• 丸一日まるいちにち — a whole day
• 丸見まるみえ — completely visible
• 丸暗記まるあんき — rote memorization / learning by heart
• 砲丸ほうがん — cannonball / shot (athletics)

• 丸まるく収おさまる — to be settled amicably

This character conveys both “roundness” and “wholeness.” You’ll see it in simple shape words like 丸 まる い, and also in expressions like 丸まるごと — meaning “entirely” or “as a whole.”