counterpoison vs antidote

counterpoison and antidote both are nouns.

Word	Noun	Adjective	Verb	Adverb
counterpoison	Yes	No	No	No
antidote	Yes	No	No	No

As nouns, counterpoison and antidote are synonyms defined as:

counterpoison and antidote: a remedy that stops or controls the effects of a poison

counterpoison (noun)	antidote (noun)
a remedy that stops or controls the effects of a poison	a remedy that stops or controls the effects of a poison