irritating vs pestiferous

irritating and pestiferous both are adjectives.

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

As adjectives, irritating and pestiferous are synonyms defined as:

Other synonyms of irritating include annoying, bothersome, galling, nettlesome, pesky, pestering, plaguey, plaguy, teasing, vexatious, vexing.

irritating (adjective)	pestiferous (adjective)
causing irritation or annoyance	causing irritation or annoyance
(used of physical stimuli) serving to stimulate or excite	likely to spread and cause an epidemic disease
causing physical discomfort	tending to corrupt or pervert
	contaminated with infecting organisms