acidic vs acid

acidic is not a noun while acid is a noun.

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

As adjectives, acidic and acid are synonyms defined as:

Other synonyms of acidic include acidulent, acidulous.

acidic (noun)	acid (noun)
	street name for lysergic acid diethylamide
	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

acidic (adjective)	acid (adjective)
being or containing an acid; of a solution having an excess of hydrogen atoms (having a pH of less than 7)	having the characteristics of an acid
being sour to the taste	being sour to the taste
	harsh or corrosive in tone