room, space, scope, margin

💡 Nuance & Usage: Often used in a metaphorical sense, referring to room for improvement, doubt, negotiation, or the possibility of something existing. (改善の余地、疑問の余地のように、物理的な空間だけでなく、比喩的に『〜の可能性』や『〜の範囲』を指す場合に多く使われます。)