spiciness vs pungency

spiciness and pungency both are nouns.

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

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

Other hyponyms of spiciness include bite, raciness, sharpness, nip, piquance, piquancy, piquantness, tang, tanginess, zest, hotness, pepperiness.

spiciness (noun)	pungency (noun)
the property of being seasoned with spice and so highly flavored	a strong odor or taste property
behavior or language bordering on indelicacy	wit having a sharp and caustic quality