nonpoisonous vs nontoxic

nonpoisonous and nontoxic both are adjectives.

Word	Noun	Adjective	Verb	Adverb
nonpoisonous	No	Yes	No	No
nontoxic	No	Yes	No	No

As adjectives, nonpoisonous and nontoxic are synonyms defined as:

Other synonyms of nonpoisonous include non-poisonous.

nonpoisonous (adjective)	nontoxic (adjective)
safe to eat	not producing or resulting from poison
not producing poison	safe to eat