ardency vs zest

ardency

• Intensity of feelings. 

• Intensity of devotion. 

• Intensity of light. 

• Intensity of heat or burning. 

zest

• Enthusiasm; keen enjoyment; relish; gusto. 

• The outer skin of a citrus fruit, used as a flavouring or garnish. 

• General vibrance of flavour. 

• The woody, thick skin enclosing the kernel of a walnut. 

• To scrape the zest from a fruit. 

• To make more zesty.