acidity vs acid

acidity and acid both are nouns.

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

acidity (noun)	acid (noun)
pH values below 7	street name for lysergic acid diethylamide
the property of being acidic	any of various water-soluble compounds having a sour taste and capable of turning litmus red and reacting with a base to form a salt
the taste experience when something acidic is taken into the mouth

acidity (adjective)	acid (adjective)
	having the characteristics of an acid
	being sour to the taste
	harsh or corrosive in tone