acridness vs bitterness

acridness and bitterness both are nouns.

Word	Noun	Adjective	Verb	Adverb
acridness	Yes	No	No	No
bitterness	Yes	No	No	No

As nouns, bitterness is a hypernym of acridness; that is, bitterness is a word with a broader meaning than acridness:

Other hypernyms of acridness include bitter.

acridness (noun)	bitterness (noun)
extreme bitterness	the property of having a harsh unpleasant taste
the quality of being sharply disagreeable in language or tone	a rough and bitter manner
	the taste experience when quinine or coffee is taken into the mouth
	a feeling of deep and bitter anger and ill-will