pepperiness vs spiciness

pepperiness and spiciness both are nouns.

Word	Noun	Adjective	Verb	Adverb
pepperiness	Yes	No	No	No
spiciness	Yes	No	No	No

As nouns, spiciness is a hypernym of pepperiness; that is, spiciness is a word with a broader meaning than pepperiness:

Other hypernyms of pepperiness include spice, spicery.

pepperiness (noun)	spiciness (noun)
a hot spiciness	the property of being seasoned with spice and so highly flavored
	behavior or language bordering on indelicacy