Gusto
Part of speech: noun
Definition: enthusiasm; enjoyment, vigor
Example sentence: I have never savored life with such gusto as I do now.
Zest
Part of speech: noun
Definition: Enthusiasm.The outer skin of a citrus fruit, used as a flavouring.
Part of speech: verb
Definition: To scrape the zest from a fruitTo make more zesty
Example sentence: If you have zest and enthusiasm you attract zest and enthusiasm. Life does give back in kind.