To an extent.. but it definately enhances the meaning of enthusiasm by about 2 ;P.

no, but at this time in the morning it is a little suggestive...

In the vernacular, it most certainly is. The words are typically listed as synonyms. One can, however, find a slight difference in the words. passion: 1often capitalized a: the sufferings of Christ between the night of the Last Supper and his death b: an oratorio based on a gospel narrative of the Passion 2obsolete : suffering 3: the state or capacity of being acted on by external agents or forces 4 a (1): emotion <his ruling passion is greed> (2)plural : the emotions as distinguished from reason b: intense, driving, or overmastering feeling or conviction c: an outbreak of anger 5 a: ardent affection : love b: a strong liking or desire for or devotion to some activity, object, or concept c: sexual desire d: an object of desire or deep interest enthusiasm: 1 a: belief in special revelations of the Holy Spirit b: religious fanaticism 2 a: strong excitement of feeling : ardor <did her work with energy and enthusiasm> b: something inspiring zeal or fervor <his enthusiasms include sailing and fishing> Passion is more a motivation from emotion. Enthusiasm can be a motivation of many things, including necessity and reason. However, for all practical intents and purposes, "passionate enthusiasm" is a redundant phrase.