• 恋こい — romantic love / longing
• 恋人こいびと — boyfriend / girlfriend / romantic partner
• 恋愛れんあい — romantic love / a love relationship
• 初恋はつこい — first love
• 失恋しつれん — heartbreak / broken romance

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恋 uses the heart radical 心 at the bottom, showing emotion and desire. The top part gives the sound レン and adds the sense of yearning. In modern Japanese, 恋 is the “romantic” kind of love — wanting someone, missing someone. Compare 愛, which leans more toward deep affection and care.