fervour vs fervency

fervour and fervency both are nouns.

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

As nouns, fervour and fervency are synonyms defined as:

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

fervour (noun)	fervency (noun)
feelings of great warmth and intensity	feelings of great warmth and intensity
the state of being emotionally aroused and worked up