fervour vs ardor

fervour and ardor both are nouns.

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

As nouns, fervour and ardor are synonyms defined as:

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

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