battery-acid vs back breaker

battery-acid and back breaker both are nouns.

Word	Noun	Adjective	Verb	Adverb
battery-acid	Yes	No	No	No
back breaker	Yes	No	No	No

As nouns, battery-acid and back breaker are synonyms defined as:

battery-acid and back breaker: street name for lysergic acid diethylamide

Other synonyms of battery-acid include acid, dose, dot, Elvis, loony toons, Lucy in the sky with diamonds, pane, superman, window pane, Zen.

battery-acid (noun)	back breaker (noun)
street name for lysergic acid diethylamide	street name for lysergic acid diethylamide