perturbing vs worrying

perturbing is not a noun while worrying is a noun.

Word	Noun	Adjective	Verb	Adverb
perturbing	No	Yes	No	No
worrying	Yes	Yes	No	No

As adjectives, perturbing and worrying are synonyms defined as:

Other synonyms of perturbing include distressful, distressing, disturbing, troubling, worrisome.

perturbing (noun)	worrying (noun)
	the act of harassing someone
	the act of moving something by repeated tugs or pushes

perturbing (adjective)	worrying (adjective)
causing distress or worry or anxiety	causing distress or worry or anxiety