ardour vs zeal

ardour and zeal both are nouns.

Word	Noun	Adjective	Verb	Adverb
ardour	Yes	No	No	No
zeal	Yes	No	No	No

As nouns, ardour and zeal are synonyms defined as:

ardour and zeal: a feeling of strong eagerness (usually in favor of a person or cause)

Other synonyms of ardour include ardor, elan.

As nouns, zeal is a hyponym of ardour; that is, zeal is a word with a more specific, narrower meaning than ardour:

ardour (noun)	zeal (noun)
intense feeling of love	prompt willingness
a feeling of strong eagerness (usually in favor of a person or cause)	a feeling of strong eagerness (usually in favor of a person or cause)
feelings of great warmth and intensity	excessive fervor to do something or accomplish some end