acidulousness vs sourness

acidulousness and sourness both are nouns.

Word	Noun	Adjective	Verb	Adverb
acidulousness	Yes	No	No	No
sourness	Yes	No	No	No

As nouns, sourness is a hypernym of acidulousness; that is, sourness is a word with a broader meaning than acidulousness:

acidulousness: the taste experience when something acidic is taken into the mouth
sourness: the taste experience when vinegar or lemon juice is taken into the mouth

Other hypernyms of acidulousness include sour, tartness.

acidulousness (noun)	sourness (noun)
the taste experience when something acidic is taken into the mouth	the property of being acidic
	a sullen moody resentful disposition
	the taste experience when vinegar or lemon juice is taken into the mouth