pestiferous vs pestilential

pestiferous and pestilential both are adjectives.

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

As adjectives, pestiferous and pestilential are synonyms defined as:

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

Other synonyms of pestiferous include pestilent, plaguey.

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