acid vs vitriolic

acid is a noun but vitriolic is not a noun.

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

As adjectives, acid and vitriolic are synonyms defined as:

Other synonyms of acid include acerb, acerbic, acrid, bitter, blistering, caustic, sulfurous, sulphurous, virulent.

acid (noun)	vitriolic (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)	vitriolic (adjective)
having the characteristics of an acid	of a substance, especially a strong acid; capable of destroying or eating away by chemical action
being sour to the taste	harsh or corrosive in tone
harsh or corrosive in tone