warmth vs fieriness

warmth and fieriness both are nouns.

Word	Noun	Adjective	Verb	Adverb
warmth	Yes	No	No	No
fieriness	Yes	No	No	No

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

warmth (noun)	fieriness (noun)
a quality proceeding from feelings of affection or love	the heat or the color of fire
the quality of having a moderate degree of heat	a passionate and quick-tempered nature
the trait of being intensely emotional
the sensation caused by heat energy
a warmhearted feeling