【字辨】
passion: 指壓倒理性的強烈情感或熱情
Her reason was overcome by passion.

fervor, ardor: 皆指燃燒般的情感,但fervor指不斷燃燒的情感的輝耀, ardor則指不安定的火焰般的熱情
religious fervor
the ardors of young people

enthusiasm: 指對於某一對象、主義等加以強烈支持的熱情,通常暗示持有達成或追求該件事的熱心
the enthusiasm for mountaineering

zeal: 指表現出精力充沛、不斷活動的enthusiasm
They were inflamed with a zeal for revolution.