poisonous vs vicious

poisonous and vicious both are adjectives.

Word	Noun	Adjective	Verb	Adverb
poisonous	No	Yes	No	No
vicious	No	Yes	No	No

As adjectives, poisonous and vicious are synonyms defined as:

Other synonyms of poisonous include venomous.

poisonous (adjective)	vicious (adjective)
not safe to eat	(of persons or their actions) able or disposed to inflict pain or suffering
marked by deep ill will; deliberately harmful	marked by deep ill will; deliberately harmful
having the qualities or effects of a poison	having the nature of vice
	bringing or deserving severe rebuke or censure