fervidness vs zeal

fervidness and zeal both are nouns.

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

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

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