battery acid vs sulphuric acid

battery acid and sulphuric acid both are nouns.

Word	Noun	Adjective	Verb	Adverb
battery acid	Yes	No	No	No
sulphuric acid	Yes	No	No	No

As nouns, sulphuric acid is a hypernym of battery acid; that is, sulphuric acid is a word with a broader meaning than battery acid:

battery acid: dilute sulfuric acid used in storage batteries
sulphuric acid: (H2SO4) a highly corrosive acid made from sulfur dioxide; widely used in the chemical industry

Other hypernyms of battery acid include oil of vitriol, sulfuric acid, vitriol.

battery acid (noun)	sulphuric acid (noun)
dilute sulfuric acid used in storage batteries	(H2SO4) a highly corrosive acid made from sulfur dioxide; widely used in the chemical industry