acidulousness vs acidity

acidulousness and acidity both are nouns.

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

As nouns, acidulousness and acidity are synonyms defined as:

acidulousness and acidity: the taste experience when something acidic is taken into the mouth

acidulousness (noun)	acidity (noun)
the taste experience when something acidic is taken into the mouth	pH values below 7
	the property of being acidic
	the taste experience when something acidic is taken into the mouth