Exuberance
Part of speech: noun
Definition: The quality of being exuberant; cheerful or vigorous enthusiasm; liveliness. An instance of exuberant behaviour.
Example sentence: In 1969, when I was still living in London, I had gone with some friends to see 'Easy Rider' in a movie theater in Piccadilly Circus and had returned alone some days later to see it again. It was Jack's combination of ease and exuberance that had captured me from the moment he had come on-screen.
Enthusiasm
Part of speech: noun
Definition: Possession by a god; divine inspiration or frenzy.Intensity of feeling; excited interest or eagerness.
Example sentence: Nobody grows old merely by living a number of years. We grow old by deserting our ideals. Years may wrinkle the skin, but to give up enthusiasm wrinkles the soul.