ardour vs fervour

ardour and fervour both are nouns.

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

As nouns, ardour and fervour are synonyms defined as:

Other synonyms of ardour include ardor, fervency, fervidness, fervor, fire.

ardour (noun)	fervour (noun)
intense feeling of love	feelings of great warmth and intensity
a feeling of strong eagerness (usually in favor of a person or cause)	the state of being emotionally aroused and worked up
feelings of great warmth and intensity