pestilent vs deadly

pestilent and deadly both are adjectives.

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

As adjectives, pestilent and deadly are synonyms defined as:

Other synonyms of pestilent include baneful, pernicious.

pestilent (adjective)	deadly (adjective)
likely to spread and cause an epidemic disease	exceedingly harmful
exceedingly harmful	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

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