pestilent vs pestiferous

pestilent and pestiferous both are adjectives.

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

As adjectives, pestilent and pestiferous are synonyms defined as:

pestilent and pestiferous: likely to spread and cause an epidemic disease

Other synonyms of pestilent include pestilential, plaguey.

pestilent (adjective)	pestiferous (adjective)
likely to spread and cause an epidemic disease	causing irritation or annoyance
exceedingly harmful	likely to spread and cause an epidemic disease
	tending to corrupt or pervert
	contaminated with infecting organisms