deadly vs venomous

deadly and venomous both are adjectives.

Word	Noun	Adjective	Verb	Adverb
deadly	No	Yes	No	Yes
venomous	No	Yes	No	No

As adjectives, deadly and venomous are synonyms defined as:

Other synonyms of deadly include virulent.

deadly (adjective)	venomous (adjective)
exceedingly harmful	marked by deep ill will; deliberately harmful
extremely poisonous or injurious; producing venom	extremely poisonous or injurious; producing venom
involving loss of divine grace or spiritual death
(of a disease) having a rapid course and violent effect
causing or capable of causing death
of an instrument of certain death

deadly (adverb)	venomous (adverb)
(used as intensives) excessively
as if dead