acid vs acidic

acid is a noun but acidic is not a noun.

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

As adjectives, acid and acidic are synonyms defined as:

Other synonyms of acid include acidulent, acidulous.

acid (noun)	acidic (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

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